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

Answers (1)

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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