1. A man wishes to swim across a river 0.5 km wide.
If he can swim at the rate of 2 km/h in still water
and the river flows at the rate of 1 km/h. The angle
made by the directon (w.r.t. the flow of the river)
along which he should swim so as to reach a point
exactly opposite his starting point, should be :
(1) 60° (2) 120° (3) 145° (4) 90°
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