document.write( "Question 381940: it takes rob 4 hours to paint a room. it takes darrin 3 hours to paint a room the same size. how long it take them to paint a similar sized room together \n" ); document.write( "
Algebra.Com's Answer #270828 by mananth(16946)\"\" \"About 
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Rob 4 hours
\n" ); document.write( "Darrin 3 hours
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\n" ); document.write( "Rob does 1/4 of the job in 1 hour
\n" ); document.write( "Darrin does1/3 of the job in 1 hour.
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\n" ); document.write( "both together will do 1/4 +1/3 of the job in 1 hour
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\n" ); document.write( "1/4 +1/3 = 7/12 of the job in 1 hour.
\n" ); document.write( "they will take 12 /7 hours to do the job together.
\n" ); document.write( "=1.7 hours
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\n" ); document.write( "m.ananth@hotmail.ca
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