Question

A man travels distance 18km/h from his house . To an exhibition by rickshaw at 15km .and return back on cycle at 20km/h. Find his average speed for the whole journey

Answer 1

Here, the man travelled 18km with the speed of 15km/h.

Again he returned back 18km with the speed of 10km/h.

Here, we can observe that the distance is same and speeds are different...

So by applying... 2×V1×V2/V1+V2

Here V1=15km/h & V2=10km/h

➡ 2×15×10/15+20
➡ 300/35
➡ 8.57km/h