Two pipes P and Q can fill an empty tank in 20 min and 10 min respecti – McqOptions

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1.	Two pipes P and Q can fill an empty tank in 20 min and 10 min respectively. R can empty a full tank in 15 minutes. If all three pipes are opened together, how much time (in minutes) will they take to fill the tank?
A.	12
B.	18
C.	10
D.	15
Answer» B. 18

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