A boy walks to his school at a distance of 6 km with constant speed of2.5 kmhr 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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B
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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