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A boy walks to his school at a distance ...

A boy walks to his school at a distance of 6 km with a speed of 2.5 km/hr and walks back with a constant speed of 4 km/hr. His average speed for round trip expressed in km/hr is

A

`(24)/(13)`

B

3

C

`(40)/(13)`

D

`4.3`

Text Solution

Verified by Experts

The correct Answer is:
C
`v _(av) = (2 v _(1) v _(2))/( v _(1) + v _(2)) =( 2 xx 2. 5 xx 4)/( 6.5) = ( 40)/(13)`
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