SOLUTION: Hi I need the formula for work problems. Joey can paint a room in 5 hours and sheila can paint it in 4 hours. How long will it take if they work together?

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Question 227574: Hi I need the formula for work problems. Joey can paint a room in 5 hours and sheila can paint it in 4 hours. How long will it take if they work together?
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
t(1/5+1/4)=1
t/5+t/4=1
4t+5t=20
9t=20
t=20/9
t=2.222
Answer: 2.222 hours