Two pipes A and B can fill a tank in 36hours and 45hours respectively.If both the pipes are opened simultaneously,how much time will be taken to fill the tank?

Two pipes A and B can fill a tank in 36hours and 45hours respective

1.	Two pipes A and B can fill a tank in 36hours and 45hours respectively.If both the pipes are opened simultaneously,how much time will be taken to fill the tank?
A.	10hours
B.	20hours
C.	15hours
D.	None of these
Answer» C. 15hours

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Two pipes A and B can fill a tank in 36hours and 45hours respectively.If both the pipes are opened simultaneously,how much time will be taken to fill the tank?

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