Important Practice Questions on AVERAGE SPEED (2)

Duration: 13 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-BASIC-COMPUTER-INSTRUCTOR/paper-1-basic-numeracy/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. 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 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits
  10. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Calculus, Relational Algebra, SQL, NoSQL
  11. Paper-2 | Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Algorithm Analysis, Sorting Algorithms, Intro to Compilers, Hashing
  12. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, Data Link Layer - Ethernet, DLL: Error Control, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware basics, Network Security, Ethical Hacking
  13. Paper-2 | Operating Systems: Introduction to OS, Process Management, Memory Management, File Management, Deadlock
  14. Paper-2 | Computer Organization and Architecture: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer, Number System, Number Representation
  15. Paper 2 | System Analysis and Design: Fundamentals of Systems and Information Systems, Fundamentals of Software Engineering, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance, Software Testing
  16. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Paper 2 | OOPS , C++ , JAVA: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  18. 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
  19. Emerging Trends and AI: Emerging Tech Trends, कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection
  20. Paper-2 | Data Processing (Ms-Office): MS Office Applications, कंप्यूटर सॉफ़्टवेयर / Computer Software, ऑपरेटिंग सिस्टम / Operating System, वर्ड प्रोसेसिंग (MS Word) / Word Processing (MS Word), प्रेज़ेंटेशन (MS PowerPoint) / Presentation Software (MS PowerPoint)
  21. Paper-2 | Internet and Web Technologies: HTML Basics, CSS, XML, JavaScript-Basics, Internet Fundamentals, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, Terms & Abbreviations, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, साइबर सुरक्षा / Cyber Safety and Security, कंप्यूटर नेटवर्क / Computer Networks
  22. Paper 2 | Pedagogy: वृद्धि और विकास / Growth and Development, विकास के सिद्धांत / Theories of Development, Concept of Pedagogy, समावेशी शिक्षा / Inclusive Education, Experiential Pedagogy, आकलन और मूल्यांकन / Assessment and Evaluation, संज्ञानात्मक प्रक्रियाएँ / Cognitive Processes, समाजीकरण और जेंडर / Socialisation and Gender, National Education Policy (NEP) 2020
  23. Live Classes: RSSB Live Sessions
  24. Paper 1 - Full Mock Tests:
  25. Paper 2 - Full Mock Tests:
  26. BCI Previous Year Papers:
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…