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Q.

A boy walks to his school at a distance of 6 km with constant speed of 2.5 kmh-1 and walks back with a constant speed of 4 kmh-1. His average speed for round trip expressed (in kmh-1), is

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a

24/13

b

40/13

c

3

d

1/2

answer is B.

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Detailed Solution

Average speed of a boy =2v1v2v1+v2=2×2.5×42.5+4                                         =206.5=4013 km/h
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