A boat covers a distance from A to B downstream and B to A upstream in 4 hours. If the speed of the stream is 2 km/hr and the speed of the boat in still water is 4 km/hr, then the distance between A and B is :
1
8 km
2
9 km
3
4 km
4
6 km
A boat covers a distance from A to B downstream and B to A upstream in 4 hours. If the speed of the stream is 2 km/hr and the speed of the boat in still water is 4 km/hr, then the distance between A and B is :