Motion in A Straight Line

Question: A river is flowing from W to E with a speed of 5 m/min. A man can swim in still water with a velocity 10 m/min. In which direction should the man swim so as to take the shortest possible path to go to the south



1) $30^o$ with downstream
2) $60^o$ with downstream
3) $120^o$ with downstream
4) South
Solution: Explanation: Explanation

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