A tap can fill a tank in 12hours,whereas another can empty it in 18hours.If both the taps are opened simultaneously,how much time will the tank take to fill?

A tap can fill a tank in 12hours,whereas another can empty it in 18

1.	A tap can fill a tank in 12hours,whereas another can empty it in 18hours.If both the taps are opened simultaneously,how much time will the tank take to fill?
A.	36hours
B.	72hours
C.	18hours
D.	12hours
Answer» B. 72hours

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A tap can fill a tank in 12hours,whereas another can empty it in 18hours.If both the taps are opened simultaneously,how much time will the tank take to fill?

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