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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 operate simultaneously, in how much time will the tak be full? (a) 7 hrs 15 min (b) 7 hrs 30 min (c) 7 hrs 45 min (d) 8 hrs |
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Answer» 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 operate simultaneously, in how much time will the tak be full? (a) 7 hrs 15 min (b) 7 hrs 30 min (c) 7 hrs 45 min (d) 8 hrs |
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