Question

A automobile travel from city a to b and return to city a by same route.The soeed of the vehicle during the onward and return journeys were constant at 60km/h and 90km/h respectively.What is the averagespeed in km/h for the entire journey?

Answer 1

Answer:

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Answer 2

Let us take the distance is D

Total distance 2D

Time t

t= D/60+D/90

We get total time as D/36

Avg speed become - 2D/(D/36)= 72