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 P in the liquid in the tank after 3 minutes?\nOptions:\n(A) 3/11\n(B) 2/11\n(C) 1/11\n(D) 4/11\n(E) 1/11 Stream of consciousness:
User
Part filled by (A + B + C) in 3 minutes = 3(1/30 + 1/20 + 1/10) = 11/20\nPart filled by A in 3 minutes = 3/30\nRequired ratio = 3/30 * 20/11 = 2/11
Thus, the answer is (B).
Assistant