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?

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

1.	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?
A.	$\frac{5}{{11}}$$
B.	$\frac{6}{{11}}$$
C.	$\frac{7}{{11}}$$
D.	$\frac{8}{{11}}$$
Answer» C. $\frac{7}{{11}}$$

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