document.write( "Question 1137052: A professor can grade three tests in the time it takes a student assistant to grade one test. Working together, they can grade the tests for a class in 2 hours.How long would it take the student assistant working alone? \n" ); document.write( "
Algebra.Com's Answer #754890 by josgarithmetic(39620)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "r, rate of student assistant
\n" ); document.write( "3r, rate of professor
\n" ); document.write( "The quantity of tests to grade is 1 job.
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\n" ); document.write( "\"%28r%2B3r%292=1\"
\n" ); document.write( "\"2%2A4r=1\"
\n" ); document.write( "\"highlight%28r=1%2F8%29\"------------------ 1 job in 8 hours, the student assistant.
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