Two pipes can fill a tank in 10hours 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 tank be filled?
(1) 8 hrs 30 min
(2) 7 hrs 30 min
(3) 8 hrs 38 min
(4) 7 hrs 38 min
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