Question

A car goes from a to b at a speed 36km/hr and returns from bto a at a speed 45 km/hr. Avg speed of the car during the whole journey is

Answer 1

Let’s consider that the person covers distance ‘d ‘from a to b
Let d be 180km
Then to and fro he covers a total distance of 2d which is 360km
From a to b time taken is =180/36=20hrs
From b to a time taken is =180/45=4hrs
Avg speed =total distance/total time
=360/24
=15 km/hr
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