GRE Exam Numerical Ability Time Distance and Speed

A person goes to a certain place at the speed 4kmph . he returns on bicycle at the speed of 16kmph. find his average speed during the whole journey

Read Solution (Total 1)

let distance be x km

ave speed = total distance/total time taken = (x+x)/(x/4 + x/16) = 2/(1/4 +1/16)
=2*4*16/(4+16)
= 2*4*16/20
= 6.4 km/h
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GRE Other Question

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