Question

Select One Option Correct from the following : A boat, which has a speed of 5 km/h in still water, crosses a river of width 1 km along the shortest possible path is 15 min. The velocity of the river water (in km/h ) is
(A) 1
(B) 3
(C) 4
(D) $\sqrt{41}$

Answer 1

a option is correct I think