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A boat can swim in still water with spee...

A boat can swim in still water with speed of 20 km/h . a river of width 500 meters flows with speed of 6 km./h. In what direction . . . . should the boat be pointed , so that it reaches the opposite bank at the point directly opposite the starting point ? Also find the time . . . . . taken. Is this the least time of crossing ?

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The correct Answer is:
`20 , theta = - (pi)/(4)`
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