A boy walks to his school at a distance of 6 km with a constant speed of 2.5 kmph and walks back with the constant speed of 4 kmph. His average speed for the round trip expressed in kmph is
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one side six kilometers with 2.5 kmph then 6/2.5=2.4 and then back words 6/4=1.5 total time 2.4+1.5=3.9 then 12/3.9= nearly 3.07
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