document.write( "Question 309656: It takes Mary 4 hours to clean the house. John can clean the house in 6 hours. Working together, how long does it take to clean the house? What formula do you use to solve this problem? \n" ); document.write( "
Algebra.Com's Answer #221461 by checkley77(12844)\"\" \"About 
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1/4+1/6=1/x
\n" ); document.write( "(6+4)/4*6=1/x
\n" ); document.write( "10/24=1/x
\n" ); document.write( "10x=24
\n" ); document.write( "x=24/10
\n" ); document.write( "x=2.4 hours working together they can clean the house.
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