A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

A tank is filled in 5 hours by three pipes A, B and C. The pipe C is

1.	A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
A.	20 hours
B.	25 hours
C.	35 hours
D.	Cannot be determined
E.	None of these
Answer» D. Cannot be determined

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