SOLUTION: 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 envel

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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?
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
If they worked together for 1 hour Sally would address 2 boxes
while Jim would have addressed 1 box.  So together they would have
addressed 3 boxes in an hour, Therefore it would only take them 1/3 
as long to address just 1 box.  So the answer is 1/3 of an hour or 20
minutes.

Edwin