If a boat can have a speed of 4 km/hr in still water, for what values of speed of river flow, it can be managed to row boat right across the river, without any drift ?

A boat man can row with a speed of 10 km/hr. in still water. The river flow steadily at 5 km/hr. and the width of the river is 2 km. if the boat man cross the river with reference to minimum distance of approach then time elapsed in rowing the boat will be:-

A boat man can row with a speed of 10 km/hr. in still water. The river flow steadily at 5 km/hr. and the width of the river is 2 km. if the boat man cross the river with reference to minimum distance of approach then time elapsed in rowing the boat will be:-

A boat man can row with a speed of 10km/hr in still water.The river flow steadily at 5km/hr and the width of the river is 2km. If the boat man cross the river with reference to minimum distance of approach then time elapsed in rowing the boat will be

A boat man can row with a speed of 10 km/hr. in still water. The river flow steadily at 5 km/hr. and the width of the river is 2 km. if the boat man cross the river with reference to minimum distance of approach then time elapsed in rowing the boat will be:-

Boat can travel with a speed of 13 km/hr in still water. If the speed of the streem is 4 km/hr, find the time taken by the boat to go 68 km downstream.

A boat, which can travel at a speed of 8 km/h in still water on a lake, is rowing in the flowing water in river. If the stream speed is 3 km/h, how fast the boat can cross a tree on the shore in traveling upstream ?