Two pipes A and B can fill an empty tank in 10 hours and 15 hours resp – McqOptions

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1.	Two pipes A and B can fill an empty tank in 10 hours and 15 hours respectively. Pipe C alone can empty the completely filled tank in 12 hours. First both pipes A and B are opened and after 5 hours pipe C is also opened. What is the total time (in hours) in which the tank will be filled?
A.	7
B.	5
C.	9
D.	8
Answer» B. 5

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