# The speed of a swimmer in still water is 20 m/s . The speed of river water is 10 m/s and is flowing due east . If he is standing on the south bank and wishes to cross he river along the sortest path , the angle at which he should make his strokes w.r.t  north is given by : Option 1)30 west Option 2)$0 \degree$Option 3)$60 \degree west$Option 4)$45 \degree west$

$20 \sin \theta = 10 \Rightarrow \theta = 30 \degree west$

Option 1)

30 west

Option 2)

$0 \degree$

Option 3)

$60 \degree west$

Option 4)

$45 \degree west$

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