A cistern is filled in 15 hours by three pipes P, Q and R. The pipe R is thrice as fast as Q and Q is thriceas fast as P. How much time will pipe P alone take to fill the tank?

A cistern is filled in 15 hours by three pipes P, Q and R. The pipe R

1.	A cistern is filled in 15 hours by three pipes P, Q and R. The pipe R is thrice as fast as Q and Q is thriceas fast as P. How much time will pipe P alone take to fill the tank?
A.	120 hrs
B.	135 hrs
C.	195 hrs
D.	Cannot be determined
Answer» D. Cannot be determined

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A cistern is filled in 15 hours by three pipes P, Q and R. The pipe R is thrice as fast as Q and Q is thriceas fast as P. How much time will pipe P alone take to fill the tank?

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