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 Q in the liquid in the tank after 3 minutes?  Choose the correct choice from the following options
A) 1/11	B) 2/11	C) 3/11	D) 4/11	E) 5/11
Part filled by (A + B + 3/11) in 3 minutes = 3(1/30 + 1/20 + 1/10) = 11/20   Part filled by B in 3 minutes = 3/20   Required ratio = 3/20 * 20/11 = 3/11   Answer:3/11
<result>C</result>
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 Q in the liquid in the tank after 3 minutes?