Pipe A can fill the tank in 8 hours and pipe...

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Pipe A can fill the tank in 8 hours and pipe B can fill it in 12 hours. If pipe A is opened at 7:00 am and pipe B is opened at 9:00 am, then at what time will the tank be full?

A. 12:00 PM

B. 12:30 PM

C. 11:48 PM

D. 12:36 PM

Answer: Option D

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