Width of a river is 30 m, river velocity is 4 m/s and rowing velocity of boatman is 5 m/s
a. Make the velocity diagram for crossing the river in shortest time. Then, find this shortest time, net velocity of boatman and drift along the river.
b. Can the boatman reach a point just opposite on the other shore? If yes then make the velocity diagram, the direction in which he should row his boat and the time taken to cross the river in this case.
c. How long will it take him to row 10 m up the stream and then back to his starting point?