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Multiple choice

A river is flowing with velocity ${ v }_{ r }=2\sqrt { 3 } m/s$.A boat has to move from A to B.Find the minimum velocity of boat in still water.

  1. $2\sqrt { 3 } m/s$
  2. 4m/s

  3. 3m/s

  4. $\sqrt { 3 } m/s$
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