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Homework Help: math

Posted by help pleaseee on Sunday, September 9, 2012 at 6:26pm.

mr. Rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4 1/2 hours.  If Mr. Rodriguez graded the papers for 1 hour and then left the job for his assistant to complete, how long will it take his assistant to finish grading papers?

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