Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minu

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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 the solution R in the liquid in the tank after 3 minutes?

Options:

A . $$\frac{5}{{11}}$$

B . $$\frac{6}{{11}}$$

C . $$\frac{7}{{11}}$$

D . $$\frac{8}{{11}}$$

Answer: Option B

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