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Multiple choice

Water current in a river from east to west has the speed of $4m/s$. A boat starts moving at $10m/s$ from south bank to reach the north bank. If boat started at ${30}^{o}$ with current, then determine the drift of boat while crossing $40m$ wide river is nearly

  1. $4+5\sqrt { 3 } \ m$
  2. $20\ m$
  3. $100\ m$
  4. $50\ m$
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