SOLUTION: You can paint 3 rooms in 60 minutes, and your cousin Bob can paint 5 rooms in 75 minutes. How long will it take you to paint 7 rooms in a house if you work together?

SOLUTION: You can paint 3 rooms in 60 minutes, and your cousin Bob can paint 5 rooms in 75 minutes. How long will it take you to paint 7 rooms in a house if you work together?

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Question 896788: You can paint 3 rooms in 60 minutes, and your cousin Bob can paint 5 rooms in 75 minutes. How long will it take you to paint 7 rooms in a house if you work together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Wow! You guys are fast!
60/3=20
1/20
75/5=15
1/20+1/15=7/x
3/60+4/60=7/x
7/60=7/x
1/60=1/x
x=60 minutes or one hour to paint 7 rooms working together
check
60/20+60/15=3+4=7
ok

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