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


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