SOLUTION: One roofing crew of 5 can finish A 3,800-foot roof in 15 hours, ans another crew of 6 can do the same job in 12 hours. If they work together, how long will it take them to finish t

Algebra ->  Rate-of-work-word-problems -> SOLUTION: One roofing crew of 5 can finish A 3,800-foot roof in 15 hours, ans another crew of 6 can do the same job in 12 hours. If they work together, how long will it take them to finish t      Log On


   

Question 830114: One roofing crew of 5 can finish A 3,800-foot roof in 15 hours, ans another crew of 6 can do the same job in 12 hours. If they work together, how long will it take them to finish the job?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/15+1/12=1/x
4/60+5/60=1/x
9/60=1/x
x=60/9=20/3 =6 2/3