Homework Help: physics

Posted by srikala on Friday, May 25, 2012 at 2:45am.

a boy walks to his school at a distance of 6km with constant speed of 2.5 k mph and walks back with a constant sped of 4 k mph. His average speed of round trip expressed in k mph is?

physics - tchrwill, Friday, May 25, 2012 at 9:37am
Time out = 6/2.5 = 2.4 hours
Time back = 6/4 = 1.5 hours
Average speed for the round trip =
(6 + 6/(2.4 + 1.5) = 3.077 kmph

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