document.write( "Question 618556: If Mark can do a job in 7 hours, and John can do it in 10 hours, how long will it take them to do it together? \n" ); document.write( "

Algebra.Com's Answer #389130 by scott8148(6628) $\"\"$ $\"About$

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(x / 7) + (x / 10) = 1 \n" ); document.write( "

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