document.write( "Question 824544: If John takes 4 hours to build a tree house and if Kevin takes 5 hours to build a tree house, what part of the job is done if they work together for 1 hour? \n" ); document.write( "
Algebra.Com's Answer #496570 by Alan3354(69443)\"\" \"About 
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If John takes 4 hours to build a tree house and if Kevin takes 5 hours to build a tree house, what part of the job is done if they work together for 1 hour?
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\n" ); document.write( "In an hour, John does 1/4 and Kevin does 1/5.
\n" ); document.write( "Add those.
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