A river is flowing from west to east at a speed 15 m/s. A boy on the south bank of the river capable of swimming at 30 m/s in still water wants to swim cross the river in the shortest time. He should swim in direction?

Question:A river is flowing from west to east at a speed 15 m/s. A boy on the south bank of the river capable of swimming at 30 m/s in still water wants to swim cross the river in the shortest time. He should swim in direction?

1.due north

2.30 degree east of north

3.30 degree west of north

4.60 degree east of north


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