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Two pipes can fill a tank in 10 hours and 12 hours respectively while a third, pipe empties the full tank in 20 hours. If all the three pipes are opened together, in how much time will the tank be filled?\r\n

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Two pipes can fill a tank in 10 hours and 12 hours respectively while a third, pipe empties the full tank in 20 hours. If all the three pipes are opened together, in how much time will the tank be filled?\r\n






 
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