Question

a boat has a speed of 5 kmph in still water. it crosses a river of width 1km along the shortest possible path in 15 min. the velocity of river is​

Answer 1

Explanation:

let the speed of river be x kmph

(5-x) × 1/4 =1

5-x =4

x = 5-4

= 1 kmph

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

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