Posted by Sha on Monday, November 10, 2008 at 6:51pm.
Assuming there is no change in productivity..
In one hour, Thomas does 1/4=25% of the job, while Julia does 1/6=16.66%. Combined they would do 25%+16.66% = 41.66% of the job in 1 hour. So, 1/.4166= 2.4 hours
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