document.write( "Question 479774: sally can address a box og envelopes in 30 minutes. her broher jim can address a box of envelopes in an hour. how long would it take both working together to address a box of envelopes?
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Algebra.Com's Answer #328711 by Edwin McCravy(20055)\"\" \"About 
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document.write( "If they worked together for 1 hour Sally would address 2 boxes\r\n" );
document.write( "while Jim would have addressed 1 box.  So together they would have\r\n" );
document.write( "addressed 3 boxes in an hour, Therefore it would only take them 1/3 \r\n" );
document.write( "as long to address just 1 box.  So the answer is 1/3 of an hour or 20\r\n" );
document.write( "minutes.\r\n" );
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document.write( "Edwin
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