A water tank is filled in 5 hours by three pipes X, Y and Z the pipe Z is thrice as fast as Y and Y is twiceÂ as fast as X. How much time will pipe X alone take to fill the water tank?

A water tank is filled in 5 hours by three pipes X, Y and Z the pipe Z

1.	A water tank is filled in 5 hours by three pipes X, Y and Z the pipe Z is thrice as fast as Y and Y is twiceÂ as fast as X. How much time will pipe X alone take to fill the water tank?
A.	60 hrs
B.	45 hrs
C.	40 hrs
D.	35 hrs
Answer» C. 40 hrs

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A water tank is filled in 5 hours by three pipes X, Y and Z the pipe Z is thrice as fast as Y and Y is twiceÂ as fast as X. How much time will pipe X alone take to fill the water tank?

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