One filling pipe P is three times faster than another filling pipe Q, if P can fill tank in 24 hours, then what is the time taken to completely fill the tank if both the pipes are opened together?

One filling pipe P is three times faster than another filling pipe Q,

1.	One filling pipe P is three times faster than another filling pipe Q, if P can fill tank in 24 hours, then what is the time taken to completely fill the tank if both the pipes are opened together?
A.	12 hours
B.	18 hours
C.	16 hours
D.	14 hours
E.	None of these
Answer» C. 16 hours

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One filling pipe P is three times faster than another filling pipe Q, if P can fill tank in 24 hours, then what is the time taken to completely fill the tank if both the pipes are opened together?

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