Question

A boatman wishes to cross a river 1km wide with the shortest time possible even when the river is flowing .His speed in still water is 20km/hr a)how should he start ?b)find the time taken to cross the river c)find stream speed if he covers 2km down stream,vertically,while crossing.
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Answer 1

His speed in still water is 20km/hr a)how should he start ?b)find the time taken to cross the river c)find stream speed

Answer 2

Answer:

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Explanation:

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