Ariver is flowing from west to east at a speed of 5 meters per minute A man on the south bank of the river capable of swimming

Question

Ariver is flowing from west to east at a speed of 5 meters per minute A man on the south bank of the river capable of swimming at 10 metres per minute in still water wants to swim across the river in the shortest time He should swim in a direction A due north B 30 east of north C 30 north of west D 60 east of north

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