Posted by mike on Thursday, January 6, 2011 at 5:27pm.
tom can mow a lawn in 4 hours. perry can mow the same lawn in 5 hours. how long for them to mow the lawn together?

Math  Ms. Sue, Thursday, January 6, 2011 at 5:29pm
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smith  Gita, Thursday, September 10, 2015 at 10:48pm
(1/4)+(1/5)=9/20
Then in one hour they can do 20/9
60*20/9= 133 minutes
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