36. 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

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(b) 6/11

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(d) 8/11

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Solution

The correct option is B
(b) 6/11

Ans:36) (b)
Part filled by (A+B+C) in 3 minutes
=3(1/30+1/20+1/10)=(3×1/60)=(11/20)
Part filled by C in 3 minutes = (3/2010)
∴Required ratio=(3/10×20/11) = 6/11

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