SOLUTION: i can paint a room in 90 minutes you can paint the same room in 120 minutes, how long will it take us to paint it together?
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Question 438639: i can paint a room in 90 minutes you can paint the same room in 120 minutes, how long will it take us to paint it together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/90+x/120=1
x/(3*30)+x/(4*30)=1
x/3+x/4=30
4x+3x=360
7x=360
x=360/7
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