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The stream of a river is flowing with a speed of 2 km/h. A swimmer can swim at a speed of 4 km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight ?

(1) 60º  (2) 90º  (3) 150º  (4) 120º 

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Correct option  (4) 120º

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