A man wishes to cross a river perpendicularly. In still water he takes 4 minutes to cross the river, but in flowing river he takes 5 minutes. If the river 100 metres wide, the velocity of the flowing water of the river is a. 10m/min. b. 15m/min. c. 20m/min. d. 30m/min.

A boat which has a speed of 6km/h in still water crosses a river of width 1 km along the shortest possible path in 20 min. the velocity of the river water in km/h is

A man wishes to cross a river flowing with velocity u swims at an angle theta with the river flow.If the man swims with speed v and if the width of the river is d , then the drift travelled by him is

A man can swim in still water t a rate of 4 km/hr. The width of the river is 1 km. how long will he take to cross the river straight, if the speed of the current is 3 km/hr? 10 m in b. 20 m in c. 15 m in d. 18 m in

A boy can swim in still water at 1m//s . He swims across a river flowing at 0.6m/s which is 336 m wide. If the travels in shortest possible time, then what time he takes to cross the river?

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current

A man crosses a 320m wide river perpendicular to the current in 4 min. If in still water he can swim with a speed 5//3 times that of the current, then the speed of the current, in m//min is

A river of width 80m is flowing at 6 m/s. A motorboat crosses the river in 10s and reaches a point directly across on the other river bank. The velocity of motorboat in still water is :

A man can swim at a speed of 3 km h^-1 in still water. He wants to cross a 500-m wide river flowing at 2 km h^-1 . He keeps himself always at an angle to 120^@ with the river flow while swimming. The time taken to cross the river is.

A man can swim in still water at a speed of 5km//h . Man crosses 1 km width of river along shortest possible path in 15 minutes . What is the speed of river in km/h?