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A tank has both an inlet pipe and an outlet pipe. Working alone, the inlet pipe can fill up the tank in 5 hours. Working

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by BTGmoderatorDC » Mon Jan 09, 2023 9:14 pm

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E

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Difficulty—

A tank has both an inlet pipe and an outlet pipe. Working alone, the inlet pipe can fill up the tank in 5 hours. Working alone, the outlet pipe can empty out the tank in 15 hours. If it is desired that the tank should be filled, from empty, exactly 6 hours after the inlet pipe is turned on at 9:30am, then at what time should the outlet pipe be opened ?

A. 10:00am
B. 10:45am
C. 12:00pm
D. 12:30pm
E. 1:30pm


OA D

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