document.write( "Question 823811: Pipe A can fill a tank in 6 hours, and pipe B can fill it in 2 hours less time than it takes drainpipe C to empty the tank. With all three pipes open, it takes 3 hours and 20 minutes to fill the tank. How long does it take drainpipe C to empty the full tank with pipes A and B closed. \n" ); document.write( "
Algebra.Com's Answer #495829 by Edwin McCravy(20054)\"\" \"About 
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