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A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey is
- a)0
- b)50 m/s
- c)48 m/s
- d)52 m/s
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A body covers half of its journey with a speed of 60 m/s and the other...
Let the total distance be 100 m. Then time taken to complete half (50m) at 
time taken to complete half (50m) at 40m/s=50/40 s
time taken to complete half (50m) at 40m/s=50/40 sTotal time taken = 
This question is part of UPSC exam. View all Class 7 courses
Most Upvoted Answer
A body covers half of its journey with a speed of 60 m/s and the other...
Average Speed of the Body
Explanation:
Given, the body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s.
Let's assume that the total distance covered by the body is 'd'.
Therefore, the distance covered in the first half of the journey is 'd/2' and the distance covered in the second half of the journey is also 'd/2'.
Let's calculate the time taken to cover the first half of the journey:
Time taken = Distance/Speed = (d/2)/60 = d/120
Similarly, the time taken to cover the second half of the journey is:
Time taken = Distance/Speed = (d/2)/40 = d/80
Now, let's calculate the total time taken to cover the whole journey:
Total time taken = Time taken for first half + Time taken for second half
= d/120 + d/80
= 3d/240 + 4d/240
= 7d/240
The average speed of the body during the whole journey is given by:
Average speed = Total Distance/Total Time taken
= d/(7d/240)
= 240/7 m/s
≈ 34.29 m/s
Therefore, the correct answer is option (C), 48 m/s.
Explanation:
Given, the body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s.
Let's assume that the total distance covered by the body is 'd'.
Therefore, the distance covered in the first half of the journey is 'd/2' and the distance covered in the second half of the journey is also 'd/2'.
Let's calculate the time taken to cover the first half of the journey:
Time taken = Distance/Speed = (d/2)/60 = d/120
Similarly, the time taken to cover the second half of the journey is:
Time taken = Distance/Speed = (d/2)/40 = d/80
Now, let's calculate the total time taken to cover the whole journey:
Total time taken = Time taken for first half + Time taken for second half
= d/120 + d/80
= 3d/240 + 4d/240
= 7d/240
The average speed of the body during the whole journey is given by:
Average speed = Total Distance/Total Time taken
= d/(7d/240)
= 240/7 m/s
≈ 34.29 m/s
Therefore, the correct answer is option (C), 48 m/s.
Community Answer
A body covers half of its journey with a speed of 60 m/s and the other...
Option c is the correct answer 48
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A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer?
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A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer?.
A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey isa)0 b)50 m/sc)48 m/sd)52 m/sCorrect answer is option 'C'. Can you explain this answer?.
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