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Multiple choice

A boat is moving across a river with the speed $3\ km/h$. The river flows at the rate of $4\ km/h$. The direction of actual velocity of boat is

  1. At an angle ${53}^{o}$ from downstream
  2. At an angle ${37}^{o}$ from upstream
  3. At an angle ${37}^{o}$ from downstream
  4. At an angle ${53}^{o}$ from upstream
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