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A pipe can fill a rooftop water containe...

A pipe can fill a rooftop water container in 12 hours and another pipe can empty 50% of the container in 10 hours. How long will it take for the empty container to be filled to 1/2 its capacity, if both the pipes are opened simultaneously?

A

15 hours

B

18 hours

C

12 hours

D

14 hours

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