Question 981128
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fill tap=1 tank/16 min=1/16 tank/min
empty tap=-1tank/8 min=-1/8 tank/min
Together=1/16 tank/min-1/8 tank/min=-1/16 tank min
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With both valves open, 1/16 of the tank will empty per minute.
Since 1/2 (8/16) of the tank is full at the start, it will take (8/16 tank/(1/16 tank/min)) 8 minutes for the tank to empty.
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Correct answer is D. emptied in 8 minutes.