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 km h^(-1)` and walks back with a constant speed of ` 4 km h^(-1)`. What is avetage speed for the round trip in `km h^(-1)` ?

A

`24//13`

B

`40//13`

C

3

D

`1//2`

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The correct Answer is:

B

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