Pipes A and B can fill a tank together in 6 hours. When Pipe C is also open, the tank can be filled in 5 hours by 3 pipes together. Pipe A's efficiency is double of Pipe B. How long will Pipe B and C take to fill the tank entirely?

Pipes A and B can fill a tank together in 6 hours. When Pipe C is also

1.	Pipes A and B can fill a tank together in 6 hours. When Pipe C is also open, the tank can be filled in 5 hours by 3 pipes together. Pipe A's efficiency is double of Pipe B. How long will Pipe B and C take to fill the tank entirely?
A.	9.75 hours
B.	10. 90 hours
C.	11.25 hours
D.	12.90 hours
Answer» D. 12.90 hours

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Pipes A and B can fill a tank together in 6 hours. When Pipe C is also open, the tank can be filled in 5 hours by 3 pipes together. Pipe A's efficiency is double of Pipe B. How long will Pipe B and C take to fill the tank entirely?

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