$A$ tap can fill an empty tank in $12$ $hours$ and another tap can empty the half-filled tank in $10$ $hours$. If both the taps are opened together,then how much time (in $hours$) will it take to fill an empty tank half-filled?

  • A
    $30$
  • B
    $20$
  • C
    $15$
  • D
    $12$

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