document.write( "Question 1104644: If two people work at washing 5 cars and one can do all 5 cars on their own in 36 minutes and the other can do all 5 on their own in 42 minutes, how long does it take to wash all 5 working together? \n" ); document.write( "
Algebra.Com's Answer #719468 by josgarithmetic(39620)\"\" \"About 
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One job is wash five cars.\r
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\n" ); document.write( "\n" ); document.write( "RATE of both people combined is \"1%2F36%2B1%2F42\" JOBS per MINUTES.\r
\n" ); document.write( "\n" ); document.write( "Lowest common denominator is \"2%2A2%2A3%2A3%2A7\".\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%281%2F36%29%287%2F7%29%2B%281%2F42%29%286%2F6%29\"\r
\n" ); document.write( "\n" ); document.write( "\"%287%2B6%29%2F252\"\r
\n" ); document.write( "\n" ); document.write( "\"13%2F252\"\r
\n" ); document.write( "\n" ); document.write( "-\r
\n" ); document.write( "\n" ); document.write( "TIME:
\n" ); document.write( "\"252%2F13\"\r
\n" ); document.write( "\n" ); document.write( "\"19.38%2Aminutes\"
\n" ); document.write( "or about 20 minutes.
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