Three pipes $A, B$ and $C$ can fill a tank from empty to full in $30$ minutes,$20$ minutes and $10$ minutes respectively. When the tank is empty,all the three pipes are opened. $A, B$ and $C$ discharge chemical solutions $P, Q$ and $R$ respectively. What is the proportion of solution $R$ in the liquid in the tank after $3$ minutes?

  • A
    $\frac{5}{11}$
  • B
    $\frac{6}{11}$
  • C
    $\frac{7}{11}$
  • D
    $\frac{8}{11}$

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