Demo: Definitions, Basic Formulas, Units and Inter-conversions

Duration: 12 min

This video lesson is available to enrolled students.

Return to /learn/SBI-PO-PRELIMS/quantitative-aptitude/speed-time-and-distance/basics-prerequisites-and-unit-conversions/asset-demo-definitions-basic-formulas-units-and-inter-conversions after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. English Language: Noun, Pronoun, Adjectives, Articles, Verb, Tenses, Subject Verb Agreement (Verb Noun Agreement), Adverb, Preposition, Conjunction, Determiner, Modals, Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Completion (Fill in the blanks), Verbal Analogy (Word Based Analogy), English Writing Ability
  2. Quantitative Aptitude: Speed Mathematics and Basic Mathematics, Number System, HCF LCM, Powers and Exponents (Surds and Indices), Sequence and Series (Series), Algebra, Percentage, Ratio and Proportion (Ratios), Average, Age Problems, Profit and Loss, Simple Interest and Compound Interest, Partnership, Mixture and Alligation, Time and Work, Pipe and Cistern, Speed Time and Distance, Mensuration and Geometry, Probability, Divisibility Rules
  3. Reasoning Ability: Inequality, Syllogisms, Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Series (Number and Letter Series) (Numerical Relations and Reasoning), Seating Arrangements, Puzzle Solving (Puzzles), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Sufficiency, Data Arrangement, Machine Input-Output
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video lecture introduces the fundamental concepts of Speed, Time, and Distance in physics. The instructor begins by defining distance as 'd' and speed as the distance traveled per hour, establishing the foundational vocabulary for the lesson. A practical word problem is then presented involving two friends, Kamlesh and Vimlesh, traveling 180 kilometers from a common starting point A to different destinations B and C. Kamlesh takes 3 hours while Vimlesh takes only 2 hours, creating a scenario to compare their speeds. The instructor utilizes a visual diagram with points A, B, and C to map the paths and explicitly writes down the travel times for each friend. Through step-by-step calculation, Kamlesh's speed is determined to be 60 km/hr (180 divided by 3), while Vimlesh's speed is calculated as 90 km/hr (180 divided by 2). This comparison highlights how speed varies inversely with time when distance remains constant. The lecture then transitions to a mnemonic device known as the 'DST Pyramid' or triangle, which visually organizes Distance, Speed, and Time to facilitate formula derivation. The pyramid demonstrates that covering the 'D' reveals S multiplied by T, while covering 'S' shows D divided by T. Finally, the session concludes with a review of unit conversions and important formulas, including the relationship between miles and kilometers (1 mile = 1.61 km) and hours to seconds (1 hour = 3600 sec).

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with an introductory title slide labeled 'SPEED, TIME & DISTANCE' by Yash Jain. The instructor begins the lesson by defining core variables on a whiteboard, explicitly writing 'd' to represent distance. The definition of speed is established as 'distance travel per hour,' and the instructor starts writing the definition for time. Visual cues include the static title slide followed by handwritten notes on a digital whiteboard, setting the stage for mathematical definitions.

  2. 2:00 – 5:00 02:00-05:00

    A word problem is introduced to illustrate the application of speed concepts. The instructor draws a diagram connecting points A, B, and C, labeling the distance from A to B as 180 km and A to C as 180 km. Two friends, Kamlesh and Vimlesh, are assigned to these paths with travel times of 3 hours and 2 hours respectively. The instructor annotates the diagram to show these variables, preparing for a calculation using the formula Speed = Distance / Time. The visual progression moves from abstract definitions to concrete application.

  3. 5:00 – 10:00 05:00-10:00

    The instructor solves the word problem by calculating individual speeds. For Kamlesh, 180 km divided by 3 hours results in a speed of 60 km/hr. For Vimlesh, 180 km divided by 2 hours results in a speed of 90 km/hr. The lecture then introduces the 'DST Pyramid' visual aid, a triangle divided into sections with operators. This tool demonstrates how to derive Speed = Distance / Time, Time = Distance / Speed, and Distance = Speed x Time by covering the desired variable.

  4. 10:00 – 11:43 10:00-11:43

    The final segment focuses on unit conversions and a summary of important formulas. A slide titled 'IMPORTANT FORMULAS' lists units for speed, distance, and time. Handwritten notes appear illustrating conversions such as '1 mile = 1.61 kms' and '1 hr -> 3600 sec'. The approximate mile conversion is highlighted in a red box, while the exact value is crossed out. Additional notes for converting speed units between km/hr and m/s are written in the top right corner before the video concludes with a 'THANKS FOR WATCHING' message.

The lecture follows a logical pedagogical progression from definition to application, then to mnemonic aids and finally unit conversion. The instructor effectively uses a comparative word problem involving two travelers to demonstrate the inverse relationship between time and speed for a fixed distance. The introduction of the DST Pyramid serves as a crucial memory aid, allowing students to derive formulas without rote memorization. The final section on unit conversions provides necessary context for real-world problem solving, ensuring students can handle different measurement systems. The visual aids, including the diagram of points A, B, and C and the DST triangle, are central to understanding the material presented.

Loading lesson…