Pipes A and B can empty a filled tank in 20 hours and 15 hours respectively, while pipe C alone can fill the same tank in x hours. The three pipes were opened simultaneously and they took 40 minutes to empty the 1/18 (one-eighteenth) part of the tank. The value of x is:

Pipes A and B can empty a filled tank in 20 hours and 15 hours respect

1.	Pipes A and B can empty a filled tank in 20 hours and 15 hours respectively, while pipe C alone can fill the same tank in x hours. The three pipes were opened simultaneously and they took 40 minutes to empty the 1/18 (one-eighteenth) part of the tank. The value of x is:
A.	21
B.	30
C.	26
D.	24
Answer» C. 26

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Pipes A and B can empty a filled tank in 20 hours and 15 hours respectively, while pipe C alone can fill the same tank in x hours. The three pipes were opened simultaneously and they took 40 minutes to empty the 1/18 (one-eighteenth) part of the tank. The value of x is:

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