Question

A motorcyclist drives from A to B with a uniform speed of 30 kmh -1 and returns back with a speed of 20 kmh -1 . Find its average speed.

Answer 1

Answer:

let distance be x km

time 1=x/30h

time2=x/20h

average speed =total distance/total time

so, average speed =2x/x/30+x/20

solve this equation

average speed =24km/ h