document.write( "Question 95753This question is from textbook
\n" ); document.write( ": A refinery tank has one fill pipe and two drain pipes. Pipe 1 can fill the tank in 3 hr. Pipe 2 takes 6 hr or longer to drain the tank pipe than pipe 3 does. If it takes 12 hr to fill the tank when the valves of all three pipes are open, how long does it take pipe 3, alone, to drain the tank? \n" ); document.write( "

Algebra.Com's Answer #69770 by jo_jo_milly_500bc(2) $\"\"$ $\"About$

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4 hours \n" ); document.write( "

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