Question

A car moves through 120km at a speed 40km/h and returns back at the speed of 60km/h calculate it's average speed?

Answer 1

Given Distance = 120km

Let the 40km/h be V1

Now,

Time taken = Distance / speed
which in our case equals 120/40 = 3 h


similarly,

we have V2 as 60km/h

The distance is going to be constant here, so
the time taken must be equal to 120/60 = 2 hours.


Now average speed = Total distance / total time taken


$= \frac{120 + 120}{3 + 2} \\ = \frac{240}{5} \\ = 48$


Hence, the Average speed here would be equal to 48km/h.

Answer 2

I hope this will help you