Two pipes U and V can fill a cistern in 12 hours and 20 hours respecti – McqOptions

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1.	Two pipes U and V can fill a cistern in 12 hours and 20 hours respectively. Pipe W can empty the tank in 8 hours. If all the three pipes are opened, then in how many hours the cistern will be full?
A.	60
B.	120
C.	150
D.	100
Answer» C. 150

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