In a stream running at 2 km hr a motorboat goes 10 km upstream and back again to the starting point ......

In a stream running at 2 km/hr, a motorboat goes 10 km upstream and back again to the starting point in 55 minutes. Find the speed (km/hr) of the motorboat in still water.

Distance = time * [B^2 – R^2] / 2*B
10 =55/60 * [B^2 – 2^2] / 2*B
B = 22 km/hr

By: Manpreet kaur