SOLUTION: It takes John 4 1/2 hours to complete a job alone, and it takes 2 hours for Laura to do the same job alone. How long would it take for them to complete the job working together?

Question 192057: It takes John 4 1/2 hours to complete a job alone, and it takes 2 hours for Laura to do the same job alone. How long would it take for them to complete the job working together?
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
john can do 2/9 of the job per hour
Laura can do 1/2 of the job per hour
:
together:
:

:
t=18/13 of an hour
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