SOLUTION: It takes Jake 11 hours to proof read a chapter and Mandy 9 hours to proof read a chapter. How long would it take them working together? (Round you answer to two decimals).

Question 627012: It takes Jake 11 hours to proof read a chapter and Mandy 9 hours to proof read a chapter. How long would it take them working together? (Round you answer to two decimals).
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
It takes Jake 11 hours to proof read a chapter
and Mandy 9 hours to proof read a chapter.
How long would it take them working together?
(Round you answer to two decimals).
:
Let t = time required when working together
Let the completed job = 1
:
A typical shared work equation
+ = 1
multiply by 99, to clear the denominators
99* + 99* = 99
cancel the denominators
9t + 11t = 99
20t = 99
t = 99/20
t = 4.95 hr together
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