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Question

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

A
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C
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D
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Solution

The correct option is B
Distance average speed = 2v1v2v1+v2=2×2.5×42.5+4
20065=4013kmhr

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