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

Algebra ->  Rate-of-work-word-problems -> 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      Log On


   

Question 602152: 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 mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Delia 8 hours
She does 1/ 8 job in 1 hour
Daisy 5 hours
she does 1/ 5 of thejob in 1 hour

Together they will do 1/ 8 + 1/ 5 in 1 hour
Together they will do 13/40 of the job in one hour
Delia works for 3 hours alone
so in 3 hours she does 3* 1/8 = 3/8 of the job.
Balance job = 1-3/8= 5/8 of the job
Together they do 13/40 of the job in 1 hour
They will take x hours to do 5/8 of the job
They will take (5/8) / (13/40) hours
=5/8 * 40/13
=25/13 hours
=
daisy will have to work with delia 25/13 hours