SOLUTION: Delia can finish a job in 8 hours. Daisy can doit in 5 hours. if delia worked for 3 hours and then daisy was asked to help her finish it,? how long will daisy have to work with del

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Question 602155: Delia can finish a job in 8 hours. Daisy can doit in 5 hours. if delia worked for 3 hours and then daisy was asked to help her finish it,? how long will daisy have to work with delia to finish the job?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Delia can finish a job in 8 hours. Daisy can doit in 5 hours.
if delia worked for 3 hours and then daisy was asked to help her finish it,?
how long will daisy have to work with delia to finish the job?
:
let t = time that Daisy worked to finish the job
then
(t+3) = total time worked by Delia
:
Let the finished job = 1
;
%28%28t%2B3%29%29%2F8 + t%2F5 = 1
Multiply by 40 to clear the denominators, results
5(t+3) + 8t = 40
5t + 15 + 8t = 40
13t = 40 - 15
13t = 25
t = 25%2F13 = 1.923 hrs which is 1 hr 55.4 minutes (worked by Daisy to finish the job)