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Multiple choice

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

  1. $1h$ and $9$ minutes
  2. $2h$ and $7$ minutes
  3. $1h$ and $12$ minutes
  4. $2h$ and $25$ minutes
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