A river is flowing from west to east at a speed of 5m per min. A man on the south bank of the river, capable of swimming at 10m per min in still water, wants to swim across the river in the shortest time. He should swim in a direction
A
Due north
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B
30o east of north
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C
30o west of north
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D
60o east of north
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Solution
The correct option is A Due north For shortest time he has to swim perpendicular to river flow i.e due North