A swimmer can swim in still water at of 10 ms-1 While crossing a river his average speed is 6 ms-1. If he crosses the river in the shortest possible time, what is the speed of flow of water?
A. 16 ms-1
B. 4 ms-1
C. 60 ms-1
D. 8 ms-1
Answer:D
A swimmer can swim in still water at of 10 ms-1 While crossing a river his average speed is 6 ms-1. If he crosses the river in the shortest possible time, what is the speed of flow of water?
A. 16 ms-1 B. 4 ms-1 C. 60 ms-1 D. 8 ms-1