Q.
A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/h and walks back with a constant speed of 4 km/h. His average speed for the round trip is
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a
5 km h−1
b
4013 km h−1
c
3 km/h
d
12 km h−1
answer is B.
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Detailed Solution
Average speed for equal distance = 2v1v2v1+v2
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