A river is flowing from east to west at a speed of $5\ m/min$ . A man on south bank of river, capable of swimming $10\ m/min$ in still water, wants to swim across the river in shortest time. He should swim

  • A

    Due north

  • B

    Due north-east

  • C

    Due north-east with double the speed of river

  • D

    None of these

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