A river is flowing from west to east at a speed of 5 m/min. A man on the south bank of the river, capable of swimming at 10 m/min in still water, swims across the shortest path distance. In what direction should he swim ?
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At an angle 30° west of north
Sol. Given 
= 5 m/min
= 10 m/min
sin θ = 
= 
= 
sin θ = 
⇒ θ = 30° (west of north)
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