Two inlets A and B can fill a cistern in 45 and 440 minutes respectively. They were opened simultaneously but A was turned off in some time while B filled the remaining cistern alone in 23 minutes. Find the time after which inlet A was closed.

Two inlets A and B can fill a cistern in 45 and 440 minutes respective

1.	Two inlets A and B can fill a cistern in 45 and 440 minutes respectively. They were opened simultaneously but A was turned off in some time while B filled the remaining cistern alone in 23 minutes. Find the time after which inlet A was closed.
A.	7 minutes
B.	8 minutes
C.	9 minutes
D.	11 minutes
Answer» D. 11 minutes

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Two inlets A and B can fill a cistern in 45 and 440 minutes respectively. They were opened simultaneously but A was turned off in some time while B filled the remaining cistern alone in 23 minutes. Find the time after which inlet A was closed.

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