A river is flowing from west to east at a speed of 5 m min A man on the south bank of the river capable of swimming at 10 m min

Question

A river is flowing from west to east at a speed of 5 m min A man on the south bank of the river capable of swimming at 10 m min in still water wants to swim across the river in shortest time He should swim a due north c 30 west of north b 30 east of north d 60 east of north

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