Question

52. A man covers a journey from place A to place B at the speed of 51kmph and returns at the speed of 57kmph. Find the average speed. a) 26.92kmph b) 54kmph c) 55kmph d)53.83kmph

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Answer 1

Answer:

Given :-

A man covers a journey from place A to place B at the speed of 51kmph and returns at the speed of 57kmph

To Find :-

Average speed

Solution :-

Let the distance from A to B be S

Now we know that

Time = Distance/Speed

From A to B

=> Time = S/51

From B to A

=> Time = S/57

Now

Average speed = Total distance covered/Total time

=> S + S/(S/51 + S/57)

=> 2S/(19S + 17S/969)

=> 2S/(36S/969)

=> 2S/(12S/323)

=> 2S × 323/12S

=> 323/6

=> 53.83 km/h

Option D

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Answer 2

Answer:

A man covers a journey from place A to place B at the speed of 51kmph and returns at the speed of 57kmph

To Find :-

Average speed

Solution :-

Let the distance from A to B be S

Now we know that