Important Practice Questions on AVERAGE SPEED (2)

Duration: 13 min

This video lesson is available to enrolled students.

Return to /learn/DELOITTE-NLA/general-aptitude-quantitative-ability/speed-time-and-distance/average-speed/asset-important-practice-questions-on-average-speed-2 after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Language Skills (English): Vocabulary, Verbal Analogy (Word Based Analogy), Noun, Pronoun, Verb, Adjectives, Adverb, Preposition, Articles, Conjunction, Tenses, Modals, Subject Verb Agreement (Verb Noun Agreement), Determiner, Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage)
  2. General Aptitude (Quantitative Ability): Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Speed Time and Distance, Mixture and Alligation, Age Problems, Partnership, Number System, HCF LCM, Divisibility Rules, Powers and Exponents (Surds and Indices), Algebra, Data Interpretation, Statistics, Sequence and Series (Series), Logarithm, Arithmetic, Speed Mathematics and Basic Mathematics
  3. General Aptitude (Reasoning Ability): Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Syllogisms, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Inequality, Logical Sequence Of Words, Seating Arrangements, Puzzle Solving (Puzzles), Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Cubes & Dices, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Analytical Reasoning (Counting Figures Reasoning), Clock, Calendar, Data Sufficiency, Analogy
  4. Technical Skills MCQ - Data Structure: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  5. Technical Skills MCQ - Networking: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, Application Layer, Mobile Technology, Network Security
  6. Technical Skills MCQ - Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, File Management, Windows OS, Linux OS, Security, Virtual Machines
  7. Technical Skills MCQ - DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, NoSQL
  8. Technical Skills MCQ - Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  9. Technical Skills MCQ - Cloud Computing: Emerging Tech Trends, Cloud Computing and IoT
  10. Technical Skills MCQ - Cyber Security: Cyber and Info Security, Security in Mobile and Wireless Computing
  11. Technical Skills (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir, Object Oriented Programming (OOPS)
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video is a lecture on calculating average speed for journeys with varying speeds over equal distances. The instructor, Yash Jain, begins by introducing the topic with a title slide. He then presents a problem where a journey is divided into three equal parts, each covered at different speeds (60 km/hr, 75 km/hr, and 45 km/hr). He explains that the standard formula for average speed, total distance divided by total time, must be used. The key insight is that since the distances are equal, the average speed is the harmonic mean of the individual speeds. He demonstrates this by setting the total distance as '3x' and calculating the time for each segment, then summing them to find the total time. The final formula is derived as 3 / (1/60 + 1/75 + 1/45), which simplifies to 50 km/hr. The video concludes with a second example involving a bird flying 400 km in four 100 km segments at different speeds, reinforcing the same concept. The video is from Knowledge Gate Eduventures and is presented as a preparation resource for competitive exams like LTI and GATE.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title slide for a lecture on "SPEED, TIME & DISTANCE" by Yash Jain. The slide features a background image of a car driving on a desert road, visually representing the topic. The instructor, Yash Jain, appears in a small window in the bottom right corner, introducing the topic. The slide also includes a logo for "YASH JAIN SIR" and "KNOWLEDGE GATE EDUCATOR". The overall presentation is clean and professional, setting the stage for an academic lesson.

  2. 2:00 – 5:00 02:00-05:00

    The video transitions to a problem statement on a whiteboard. The question asks to find the average speed of a journey where one third is covered at 60 km/hr, another third at 75 km/hr, and the last third at 45 km/hr. The instructor begins to solve it by writing down the key information: (1) Speed ✓, (2) Distance covered same, (3) Speed ✓. He explains that since the distances are equal, the average speed is not the arithmetic mean but the harmonic mean. He sets the total distance as '3x' and begins to write the formula for average speed: total distance / total time.

  3. 5:00 – 10:00 05:00-10:00

    The instructor continues to solve the problem. He writes the formula for average speed as 3x / (x/60 + x/75 + x/45). He then factors out 'x' from the denominator, simplifying the expression to 3 / (1/60 + 1/75 + 1/45). He proceeds to find a common denominator for the fractions in the denominator, which is 180. The expression becomes 3 / (3/180 + 2.4/180 + 4/180), which simplifies to 3 / (9.4/180). He then calculates the final answer as 3 * 180 / 9.4, which is approximately 50 km/hr. He emphasizes that this is the harmonic mean of the three speeds.

  4. 10:00 – 12:59 10:00-12:59

    The video presents a second example. The question is about a bird flying 400 km, with the first 100 km at 100 km/hr, the second at 200 km/hr, the third at 300 km/hr, and the last at 400 km/hr. The instructor explains that this is another case of equal distances. He writes the formula for average speed as total distance / total time, which is 400 / (100/100 + 100/200 + 100/300 + 100/400). He simplifies this to 400 / (1 + 0.5 + 0.333 + 0.25), which equals 400 / 2.0833, resulting in an average speed of approximately 192 km/hr. The video ends with a "THANKS FOR WATCHING" screen.

The video provides a clear and structured lesson on calculating average speed for journeys with equal distances but different speeds. It begins by establishing the fundamental formula for average speed and then applies it to a specific problem. The key teaching point is the distinction between arithmetic and harmonic mean, emphasizing that for equal distances, the average speed is the harmonic mean of the individual speeds. The instructor uses a step-by-step approach, writing out the equations and simplifying them to arrive at the final answer. The second example reinforces the concept, showing its application to a different scenario. The overall flow is logical, moving from theory to practical application, making it an effective study resource for students preparing for competitive exams.

Loading lesson…