A man goes from A to B at a speed of 20 kmph and comes back to A at a – InterviewSolution

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1.

A man goes from A to B at a speed of 20 kmph and comes back to A at a speed of 30 kmph. Find his average speed for the entire journey?

Answer»

Distance from A and B be 'd'

Average Speed = total distance/total time

Average Speed = (2D)/[(d/20) + (d/30)]

= (2d)/[5d/60) => 24 kmph.

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