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[" A river flows from east to west with ...

[" A river flows from east to west with a speed of "],[5m/min" .A man on south bank of river,capable of "],[" swimm.A man on south bank of river,capable of "],[" swimming at the rate of "10m/min" in shortest time; he "],[" should swim: "],[" (1) due north "],[" (2) due north-east "],[" (3) due north-east with double the speed of river "],[" (4) none of the above "]

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