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A person reaches a point directly opposite on the other bank of a river. The velocity of the water in the river is 4 $ms^{-1}$ and the velocity of the person in still water is 5 $ms^{-1}$. If the width of the river is 84.6 m , time taken to cross the river in seconds is

$\begin {array} {1 1} (1)\;28.2 & \quad (2)\;9.4 \\ (3)\;2 & \quad (4)\;84.6 \end {array}$

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(1) 28.2
answered Nov 7, 2013 by pady_1

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