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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 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

A

`24/13`

B

`40 / 13`

C

3

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
B
Total time taken , `t = (6)/(2.5) + 6/4 = 12/5 + 3/2 = 39/10h`
Average speed , `v_(av) = (6+6)/(39//10)=120/39 =40/13 ` km/h
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