Quantitative Aptitude :: Average - Discussion

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Explanation:
Avg. Speed = (Total Distance /Total Time)

Total Distance = 10*4 = 40m 0r 0.04 km.

So, avg. Speed = 0.04/[(0.01/10)+(0.01/15) + (0.01/20) + (0.01/25)]
=15.58kmph