A river flows from east to west with a speed of \( 5 \mathrm{~m} / \mathrm{min} \). A man on sou...

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A river flows from east to west with a speed of \( 5 \mathrm{~m} / \mathrm{min} \). A man on south bank of river, capable of swimming at the rate of \( 10 \mathrm{~m} / \mathrm{min}\) in still water, wants to swim across the river in shortest time he should swim 
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