A Boy Wishes to Row Across a River in the Shortest

Multiple Choice

A boy wishes to row across a river in the shortest possible time. He can row at 2 m/s in still water and the river is flowing at 1 m/s. At what angle
$\theta$
should he point the bow (front) of his boat?

A) 30


B) 45
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C) 60
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D) 63
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E) 90
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