A river $4.0$ miles wide is flowing at the rate of $2miles/h$. The minimum time taken by a boat to cross the river with a speed $V=4miles/h$ (in still water) is approximately
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A river $4.0$ miles wide is flowing at the rate of $2miles/h$. The minimum time taken by a boat to cross the river with a speed $V=4miles/h$ (in still water) is approximately