Question

A boat, which has a speed of 5km/h in still water, crosses a river of width 1km along the shortest path possible in 15 minutes.

Answer 1

Answer:

Explanation:

u=3m/s

Answer 2

Answer:

The velocity of river stream is 3 km/hr.

Explanation:

The speed of the boat along the shortest possible path

$AB = \frac{1}{\frac{15}{16} } = 4 km/hr$

Now, The velocity of river water

$V = \sqrt{5^{2}-4^{2} } = \sqrt{25-16} = \sqrt{9} = 3 km/hr$