Pipes A and B together take 20 hours, B and C together take 15 hours, and C and A together take 12 hours to fill a tank. In what time will the tank be filled if all 3 pipes work together?

Pipes A and B together take 20 hours, B and C together take 15 hours,

1.	Pipes A and B together take 20 hours, B and C together take 15 hours, and C and A together take 12 hours to fill a tank. In what time will the tank be filled if all 3 pipes work together?
A.	10 hours
B.	15 hours
C.	12.5 hours
D.	5 hours
E.	7.5 hours
Answer» B. 15 hours

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Pipes A and B together take 20 hours, B and C together take 15 hours, and C and A together take 12 hours to fill a tank. In what time will the tank be filled if all 3 pipes work together?

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