document.write( "Question 972456: A tank can be filled by one pipe in four hours and by a second pipe in six hours; and when it is full, the tank can be drained by a third pipe in three hours. If the tank is empty and all three pipes are open, in how many hours will the tank be filled? \n" ); document.write( "
Algebra.Com's Answer #594774 by Alan3354(69443)\"\" \"About 
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