Aptitude - Pipes and Cisterns - Discussion

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Q.

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. 5/11 B. 6/11
C. 7/11 D. 8/11

Answer: Option B
Explaination:

 


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