Question

A motorcyclist drives from point A to point B with a uniform speed of 30 km h^–1 and returns back to point A with a uniform speed of 20 km h^–1. Find the average speed of the motorcyclist.

Answer 1

Let AB = x

So t₁ = x / 30 and t₂ = x / 20

Total Time = t₁ + t₂ = 5 / 60

Average speed = Total distance / Total time