Defence Exam > Defence Questions > A person goes from point J to K with a speed ...
Start Learning for Free
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?
- a)90
- b)96
- c)100
- d)104
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A person goes from point J to K with a speed of 80 km/hr and returns b...
GIVEN:
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr
FORMULA USED:
Speed = Distance/Time
Average speed = Total distance/ Total time taken
CALCULATION:
Let the distance be ‘d’ km
Time taken while going = d/80
Time taken while returning = d/120
Total time taken = d/80 + d/120
Average speed = Total distance/ Total time taken
Total distance is equal to twice the distance between J and K i.e 2d
Average speed = 2d/(d/80 + d/120) = 2 × 120 × 80/200 = 96 km/hr
Most Upvoted Answer
A person goes from point J to K with a speed of 80 km/hr and returns b...
Given:
- Speed while going from J to K = 80 km/hr
- Speed while returning from K to J = 120 km/hr
To find:
- Average speed of the person while going from J to K and coming back
Explanation:
Average speed is defined as the total distance traveled divided by the total time taken.
Let's assume that the distance from J to K and back is 'd' km.
Calculating the time:
- Time taken while going from J to K = distance / speed = d / 80
- Time taken while returning from K to J = distance / speed = d / 120
Calculating the total time:
- Total time taken = time taken while going + time taken while returning
= d / 80 + d / 120
= (3d + 2d) / (3 * 2 * 80)
= 5d / 480
= d / 96
Calculating the average speed:
- Average speed = total distance / total time
= 2d / (d / 96)
= 2 * 96
= 192 km/hr
Conclusion:
The average speed of the person while going from J to K and coming back is 192 km/hr.
Therefore, the correct answer is option B) 96.
- Speed while going from J to K = 80 km/hr
- Speed while returning from K to J = 120 km/hr
To find:
- Average speed of the person while going from J to K and coming back
Explanation:
Average speed is defined as the total distance traveled divided by the total time taken.
Let's assume that the distance from J to K and back is 'd' km.
Calculating the time:
- Time taken while going from J to K = distance / speed = d / 80
- Time taken while returning from K to J = distance / speed = d / 120
Calculating the total time:
- Total time taken = time taken while going + time taken while returning
= d / 80 + d / 120
= (3d + 2d) / (3 * 2 * 80)
= 5d / 480
= d / 96
Calculating the average speed:
- Average speed = total distance / total time
= 2d / (d / 96)
= 2 * 96
= 192 km/hr
Conclusion:
The average speed of the person while going from J to K and coming back is 192 km/hr.
Therefore, the correct answer is option B) 96.
|
Explore Courses for Defence exam
|
|
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer?
Question Description
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer?.
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer?.
Solutions for A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Defence.
Download more important topics, notes, lectures and mock test series for Defence Exam by signing up for free.
Here you can find the meaning of A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer?, a detailed solution for A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A person goes from point J to K with a speed of 80 km/hr and returns back with a speed 120 km/hr. What is the average speed (in km/hr. of the person while going from J to K and coming back?a)90b)96c)100d)104Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Defence tests.
|
|
Explore Courses for Defence exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup