Two pipes can fill a cistern in 28 and 21 hours respectively and anoth – McqOptions

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1.	Two pipes can fill a cistern in 28 and 21 hours respectively and another pipe can empty 3 gallons of water per hour. All the three pipes working together can fill the empty cistern in 84 hours. What is the capacity (in gallons) of the cistern?
A.	32
B.	36
C.	42
D.	40
Answer» D. 40

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