A boat can travel at a speed of 3 m/s on still water. A boatman wants to cross a river whilst covering the shortest possible distance. In what direction should he row with respect to the bank if the speed of water is (i) 2 m/s (ii) 4 m/s ? Assume that the speed of the water is the same everywhere.
Part (i) seems to be trivial but I couldn't solve part (ii). Please help (Speed of water is greater than the speed the boat can travel, so resultant velocity is not perpendicular).