SOLUTION: Pls. help me Romil can paint a fence in 4 hours, while Dina can do it in 5 hours. If the work together what part of the fence can they paint together in one hours? How long wil

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Pls. help me Romil can paint a fence in 4 hours, while Dina can do it in 5 hours. If the work together what part of the fence can they paint together in one hours? How long wil      Log On


   

Question 248197: Pls. help me
Romil can paint a fence in 4 hours, while Dina can do it in 5 hours. If the work together what part of the fence can they paint together in one hours? How long will it take them to finish painting the fence if they work together?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Romil can paint a fence in 4 hours, while Dina can do it in 5 hours.
If the work together what part of the fence can they paint together in one hours?
How long will it take them to finish painting the fence if they work together?
:
Find out how long to complete the job first.
:
Let t = time required when working together
Let the completed job = 1
:
t%2F4 + t%2F5 = 1
Multiply equation by 20, to get rid of the denominators, results:
5t + 4t = 20
9t = 20
t = 20%2F9
t = 2.22 hrs
:
In 1 hr they can paint 1%2F2.22 = .45 or 45% of the fence in 1 hr