document.write( "Question 457901: An old machine requires three times as many hours to complete a job as a new machine. When both machines work together, they require 9 hours to complete a job. How many hours would it take the new machine to finish the job operating alone?
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Algebra.Com's Answer #314107 by richwmiller(17219) $\"\"$ $\"About$

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o=3n
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\n" ); document.write( "The new machine can do it in 12 hours working alone.\r
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