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Question

# A boy walks to his school at a distance of 9 km with constant speed of 3 kmh−1 and walks back with a constant speed of 6 kmh−1. His average speed for round trip in ( kmh−1) is

A
3
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B
4
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C
5
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D
6
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Solution

## The correct option is B 4Total distance travelled by the boy =9 km+9 km=18 km using time taken =distance travelledspeed Total time taken by the boy for to and fro journey =93+96=3+1.5=4.5 h Average speed=Total distance travelledTotal time taken ⇒Average speed=184.5 kmh−1 ∴Average speed=4 kmh−1

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