Two pipes P and Q can ﬁll an empty tank in 25 hours and 20 hours res – McqOptions

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1.	Two pipes P and Q can ﬁll an empty tank in 25 hours and 20 hours respectively. Pipe R alone can empty the completely ﬁlled tank in 50 hours. Firstly both the pipes P and Q are opened and after 8 hours pipe R is also opened. What will be the total time (in hours) taken to completely ﬁll the tank?
A.	12
B.	10
C.	14
D.	13
Answer» B. 10

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