SOLUTION: If it takes Roger 60 minutes to paint a wall. It takes Stephanie 40 minutes to paint the same wall. How long will it take Roger and Stephanie to paint the wall if the work together

Question 338508: If it takes Roger 60 minutes to paint a wall. It takes Stephanie 40 minutes to paint the same wall. How long will it take Roger and Stephanie to paint the wall if the work together?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
These work problems are set up the same way...
t/A + t/B = 1
where t is the time worked together, and A and B are how lojng it takes themn by themselves and the 1 represents one job...so plugging in we get
t/40 + t/60 = 1 multiply by 120
3t + 2t = 120
5t = 120
t = 24 min
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