Question

- A swimmer can swim in still water with a speed of 15 m/s.
While crossing a river his average speed is 3 m/s. If he
crosses the river in the shortest possible time, what is the
speed of flow of water?
(a) 2m/s
(b) 4 m/s
(c) 6 m/s
(d) 8 m/s​

Answer 1

Answer:

a.2

Explanation:

explanation is in above image

Answer 2

Answer:

2m/s

Explanation:

a is correct answer