$A$ river is flowing from east to west at a speed of $5\, m/min$. $A$ man on the south bank of the river,capable of swimming $10\, m/min$ in still water,wants to swim across the river in the shortest time. He should swim:
- ADue north
- BDue north-east
- CDue north-east with double the speed of the river
- DNone of these
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