Concept of Relative Speed Required for Problem on Trains

Duration: 19 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: अनुपात और समानुपात / Ratio and Proportion, Divisibility Rules, मिश्रण और एलिगेशन / Mixture and Alligation, Permutation and Combination, Logarithm, संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Sequence and Series (Series), समय, चाल और दूरी / Time, Speed and Distance, प्रतिशत / Percentage, औसत / Average, घन क्षेत्रमिति / Solid Mensuration, Age Problems, Arithmetic, Statistics, Probability, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, समय और कार्य / Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers
  3. Paper-1 & 2 | Data Interpretation: आँकड़ा निर्वचन / Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, Data Sufficiency, अशाब्दिक तर्क / Non-Verbal Reasoning, Syllogisms, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, Analytical Reasoning (Counting Figures Reasoning), गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, कैलेंडर एवं घड़ी / Calendar and Clock, Clock, घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, सादृश्यता एवं वर्गीकरण / Analogy and Classification, क्रम एवं रैंकिंग / Order and Ranking, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, Data Arrangement, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: आँकड़ों की पर्याप्तता एवं निर्णय क्षमता / Data Sufficiency and Decision Making
  7. Paper-1 | General Science: वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: राज्य विशेष सामान्य ज्ञान / State-Specific General Knowledge, समसामयिकी / Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection, कंप्यूटर नेटवर्क / Computer Networks
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: वृद्धि और विकास / Growth and Development, Concept of Pedagogy, संज्ञानात्मक प्रक्रियाएँ / Cognitive Processes, विकास के सिद्धांत / Theories of Development, समावेशी शिक्षा / Inclusive Education, Experiential Pedagogy, समाजीकरण और जेंडर / Socialisation and Gender, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video, presented by Yash Jain from Knowledge Gate Eduventures, focuses on solving "Problem on Trains" and understanding "Relative Speed" concepts ranging from basic to advanced levels. The lecture begins by defining relative speed using visual aids of runners and cars moving in opposite directions, establishing that speeds are added in such cases. The instructor then transitions to scenarios involving objects moving in the same direction, where speeds are subtracted. Throughout the video, the instructor uses humorous memes and relatable analogies, such as "Before Relationship" and "After Relationship," to make the mathematical concepts more engaging and memorable for students. The session concludes with the application of these concepts to solve two distinct word problems: one involving constant speeds and another involving variable speeds that change every hour, demonstrating a step-by-step method for calculating meeting times in complex scenarios. The video is designed to help students prepare for competitive exams by mastering motion problems.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card displaying "PROBLEM ON TRAINS" and "Basic To Advance" alongside an image of a blue train emitting smoke. The instructor, Yash Jain, is introduced with the text "by YASH JAIN" and "KNOWLEDGE GATE EDUCATOR". The scene transitions to a slide titled "Relative Speed". This slide features a diagram of two silhouettes of runners moving in opposite directions, labeled with speeds "x m/s" and "y m/s". A green box below them indicates the "Relative Speed" is "(x+y) m/s". To the right, there is an illustration of a yellow car and a white car moving in opposite directions, each with a speed of "25 m/s". A green box below the cars states "relative speed = 50 m/s", visually reinforcing the concept that relative speed in opposite directions is the sum of individual speeds. The instructor is visible in the bottom left corner, preparing to explain these concepts. The "KG" logo is visible at the bottom.

  2. 2:00 – 5:00 02:00-05:00

    The slide title changes to "Relative Speed (Before Relationship)". A meme image appears with the text "Bete Moj Kardi" and a laughing emoji, used to introduce the concept humorously. The instructor draws a diagram on the screen showing two points separated by a distance of "5 km". He writes "3 km/hr" with an arrow pointing right and "2 km/hr" with an arrow pointing left, indicating two objects moving towards each other. He calculates the distance covered in "1 hr" as "3km" and "2km" respectively, summing to "5 km", which matches the total distance. He then generalizes this by writing "x km/hr" and "y km/hr" with arrows pointing towards each other, establishing the formula for relative speed as "x+y". This section solidifies the understanding of relative speed when objects approach each other from opposite ends. The watermark "Hasle.Bhai" is visible on the meme.

  3. 5:00 – 10:00 05:00-10:00

    The topic shifts to "Relative Speed (After Relationship)" with a meme titled "Abhi Maja Aayga Na Bhidu". The instructor draws two arrows pointing in the same direction, labeled "x km/hr" and "y km/hr". He circles "x-y" to indicate that relative speed in the same direction is the difference between the speeds. He compares this with the previous case, writing "1" for opposite direction (x+y) and "2" for same direction (x-y). He uses a meme showing "1+1=1" to humorously explain that in relative speed, the logic changes based on direction. He then moves to a specific problem on a yellow background titled "Que: Distance between Jetha and Babita Ji is 550 km. Both start walking towards each other with the speed of 60 km/hr and 50 km/hr respectively. Find the time taken by them to meet each other." He draws a line with "J" and "B" at the ends, marking the distance as "550 km". The watermark "Be.Indian" is visible.

  4. 10:00 – 15:00 10:00-15:00

    Continuing with the Jetha and Babita problem, the instructor writes "60 km/hr" above "J" and "50 km/hr" above "B" with arrows pointing towards each other. He calculates the relative speed by adding the two speeds: 60 + 50 = 110 km/hr. He then applies the formula Time = Distance / Speed. He writes "550 / 110" and calculates the result as "5 hours". This example serves as a practical application of the relative speed concept for objects moving towards each other with constant speeds. The instructor ensures the steps are clear, showing the addition of speeds and the subsequent division of total distance by the combined speed to find the meeting time. The "KG" logo is visible at the bottom.

  5. 15:00 – 18:34 15:00-18:34

    A new problem is introduced: "A boy from Delhi and a girl from Meerut started walking towards each other. They both started with the speed of 5 km/hr. After every 1 hour the boy increased his speed by 1 km/hr and the girl decreased her speed by 1 km/hr. Distance between Delhi and Meerut is 110 km. find the time taken by them to meet each other." The instructor sets up a table to track the speeds. For the first 6 hours, he lists the boy's speed increasing (5, 6, 7, 8, 9, 10) and the girl's speed decreasing (5, 4, 3, 2, 1, 0). He notes that the total speed per hour remains constant at 10 km/hr. He calculates the total distance covered in 6 hours as 60 km. The remaining distance is 50 km. He then calculates the time for the remaining distance by summing the boy's speeds (11, 12, 13, 14) which equals 50, taking 4 hours. Finally, he adds the times: 6 + 4 = 10 hours. The "YASH JAIN SIR" banner appears at the end.

The video provides a comprehensive guide to solving relative speed problems, starting with fundamental definitions and progressing to complex scenarios involving variable speeds. The instructor effectively uses visual aids, memes, and step-by-step board work to clarify concepts like adding speeds for opposite directions and subtracting for same directions. The transition from constant speed problems to variable speed problems demonstrates a logical progression in difficulty, equipping students with the tools to handle various types of "Train Problems" and motion questions found in competitive exams. The use of humor helps maintain student engagement while delivering rigorous mathematical content.

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