Q Two pipes P and Q can fill an empty tank in 20 minutes and 10 minutes respectively. R can empty a full tank in x minutes. If all three pipes are opened simultaneously, tank is full in 12 minutes. The value of x is:

A. 18 minutes
B. 20 minutes
C. 30 minutes
D. 15 minutes

Correct Answer: D

Explanation:
1/20 + 1/10 - 1/x = 1/12 => 3/20 - 1/x = 1/12 => 1/x = 3/20 - 1/12 = 1/15 => x = 15 minutes.

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