$A$ and $B$ can complete a piece of work in $30 \text{ days}$,$B$ and $C$ can complete the same work in $20 \text{ days}$,and $A$ and $C$ can complete it in $15 \text{ days}$. If all of them work together,the time taken to complete the work will be? (in $days$)

  • A
    $10$
  • B
    $12$
  • C
    $12 \frac{2}{3}$
  • D
    $13 \frac{1}{3}$

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