The speed of a boat is 5 km/h in still water. It crosses a river of width 1.0 km along the shortest peth in minutes. The velocity (in km/h) of the river water is:

Options

A. 5
B. 1
C. 3
D. 4

Answer

C

Explanation

The resultant velocity of the boat and river is 1.0km/0.25h=4km/h Velocity of the river= `sqrt(5^(2)-4^(2))`=3 km/ h