Two inlet pipes can fill a cistern in 5 and 6 hours respectively and a – McqOptions

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1.	Two inlet pipes can fill a cistern in 5 and 6 hours respectively and an outlet pipe can empty 24 gallons of water per hour. All the three pipes working together can fill the empty cistern in 10 hours. What is the capacity (in gallons) of the tank?
A.	90
B.	180
C.	60
D.	120
Answer» B. 180

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