Short Trick to Solve Comparison Problem in Boats & Stream

Duration: 13 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Number System, Divisibility Rules, HCF LCM, Arithmetic, Percentage, Ratio and Proportion (Ratios), Average, Powers and Exponents (Surds and Indices), Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Age Problems, Partnership, Algebra, Permutation and Combination, Probability, Logarithm, Mensuration and Geometry, Time and Work, Speed Time and Distance, Data Interpretation, Sequence and Series (Series), Gamified / Game Based Aptitude, Speed Mathematics and Basic Mathematics
  2. Problem Solving & Reasoning: Coding Decoding, Data Sufficiency, Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Inequality, Venn Diagram, Ranking, Order and Sequence, TCS NQT Advanced Reasoning Ability, Crypt Arithmetic, Analytical Reasoning (Counting Figures Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Completion (Fill in the blanks), Sentence Correction (Error Correction), Subject Verb Agreement (Verb Noun Agreement), Tenses, Articles, Preposition, Modals, Vocabulary
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The user wants a high-quality study summary of an educational video about "Boats and Streams" problems. I need to analyze the video content and structure the output into a specific JSON format. The video is approximately 13 minutes and 28 seconds long. The required timeline windows are: - 00:00-02:00 - 02:00-05:00 - 05:00-10:00 - 10:00-13:28 **Video Content Analysis:** * **00:00 - 02:00:** The video starts with an intro sequence showing "Boats & Stream" and "Boats & Streams Problems". The instructor, Yash Jain, introduces the topic. He mentions "Matrix bana dene ka bhidu, bole to ekdam jhakaas" (A Hindi phrase meaning "Making a matrix is a great trick, it's super cool"). He sets up the first problem: "A boat goes 20 km upstream and 30 km downstream in 3 hours. It can go 10 km upstream and 20 km downstream in 5/3 hours. Find the sum of speed of boat in still water and speed of stream." He starts organizing the data into a matrix/table format: Upstream (dist), Downstream (dist), Time. * Row 1: 20, 30, 3 * Row 2: 10, 20, 5/3 * He explains the cross-multiplication method (matrix method) to find the upstream speed (u) and downstream speed (d). * Calculation for Upstream (u): (20*20 - 30*10) / (3*20 - 5/3*30) -> Wait, let's look closer at the board. * He writes: Upstream

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The user wants a high-quality study summary of an educational video about "Boats and Streams" problems. I need to analyze the video content and structure the output into a specific JSON format. The video is approximately 13 minutes and 28 seconds long. The required timeline windows are: - 00:00-02:00 - 02:00-05:00 - 05:00-10:00 - 10:00-13:28 **Video Content Analysis:** * **00:00 - 02:00:** The video starts with an intro sequence showing "Boats & Stream" and "Boats & Streams Problems". The instructor, Yash Jain, introduces the topic. He mentions "Matrix bana dene ka bhidu, bole to ekdam jhakaas" (A Hindi phrase meaning "Making a matrix is a great trick, it's super cool"). He sets up the first problem: "A boat goes 20 km upstream and 30 km downstream in 3 hours. It can go 10 km upstream and 20 km downstream in 5/3 hours. Find the sum of speed of boat in still water and speed of stream." He starts organizing the data into a matrix/table format: Upstream (dist), Downstream (dist), Time. * Row 1: 20, 30, 3 * Row 2: 10, 20, 5/3 * He explains the cross-multiplication method (matrix method) to find the upstream speed (u) and downstream speed (d). * Calculation for Upstream (u): (20*20 - 30*10) / (3*20 - 5/3*30) -> Wait, let's look closer at the board. * He writes: Upstream (dist) 20, 10. Downstream (dist) 30, 20. Time 3, 5/3. * He calculates the numerator for Upstream speed: (20 * 20) - (30 * 10) = 400 - 300 = 100. * He calculates the denominator for Upstream speed: (3 * 20) - (5/3 * 30) = 60 - 50 = 10. * So, Upstream speed (u) = 100 / 10 = 10 km/h. * He then calculates Downstream speed (d). Numerator: (20 * 5/3) - (10 * 3) -> No, looking at the board, he does (20 * 5/3) - (30 * 3) ... wait, let's re-examine the board at 05:00. * Actually, at 05:00, he is calculating the denominator for Downstream speed. * Let's look at the board at 05:30. He writes "Upstream (u) = 100 / 10 = 10". * Then he calculates Downstream (d). Numerator: (20 * 5/3) - (10 * 3) ... wait, the cross multiplication is usually (A*D - B*C). * Let's look at the board at 05:45. He writes "Downstream (d) = 100 / (10/3) = 30". * So, Downstream speed (d) = 30 km/h. * Finally, he calculates the speed of the boat in still water: (D + U) / 2 = (30 + 10) / 2 = 20 km/h. * And the speed of the stream: (D - U) / 2 = (30 - 10) / 2 = 10 km/h. * The question asked for the *sum* of speed of boat in still water and speed of stream. Sum = 20 + 10 = 30 km/h. Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, the question asks for "sum of speed of boat in still water and speed of stream". * Let's check the board at 06:00 again. He writes "Still water = 20". "Current = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still

  2. 2:00 – 5:00 02:00-05:00

    water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". 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"Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". 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  3. 5:00 – 10:00 05:00-10:00

    "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". 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"Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he

  4. 10:00 – 13:28 10:00-13:28

    writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06

(D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06:00, he writes "Still water = (D+U)/2 = 40/2 = 20". "Current = (D-U)/2 = 20/2 = 10". * Wait, looking at the board at 06

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