document.write( "Question 735650: Susan can paint a room in 4 hours. Her younger sister Kay can do the same job in 6 hours. In how many hours can they do the job if they work together?\r
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Algebra.Com's Answer #449507 by checkley79(3341)\"\" \"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 cross multiply.
\n" ); document.write( "10x=24
\n" ); document.write( "x=24/10
\n" ); document.write( "x=2.4 hours working together.
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