Three pipes A B and C can fill a tank from empty to full in 30 minutes 20 minutes and 10 minutes res...........

Quantitative Aptitiude (CLAT) Time and work

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?

5/11

6/11

7/11

8/11

Explanation:

Explanation: Part filled by (A + B + C) in 3 minutes = 3 (1 / 30 + 1 / 20 + 1 / 10) = (3 * 11 / 60) = 11 / 20
Part filled by C in 3 minutes = 3 / 10
Therefore, required ratio = (3 / 10 * 20 / 11) = 6/11