A boat travel 20 km upstream in 6 hrs and 18 km downstream in 4 hrs Find the speed of boat in still water and the speed of water current?

Let the velocity in still water be V and the current be U. The net velocity upstream (against the current) is 20/6 = V - U . The net velocity downstream is ,18/4 = V + U. Add the equations to get 7.83 = 2V . Subtract the equations to get, 1.17 = 2U. So, V= 3.91 and U = .58