SOLUTION: Ella can do a job for 5 hours while it takes Lyn 3 hours to do the same job. Ella worked on the job alone for 30 minutes then joined by Lyn. In how many hours will the job be finis

Question 486782: Ella can do a job for 5 hours while it takes Lyn 3 hours to do the same job. Ella worked on the job alone for 30 minutes then joined by Lyn. In how many hours will the job be finished?
Answer by chessace(471) (Show Source): You can put this solution on YOUR website!
E does 1/5 job per hour, L does 1/3 per H.
E does .5 * 1/5 job alone = 0.1 job.
Together they do 1/5 + 1/3 per hour, total (3+5)/15 job/H
Let as usual answer = x = hours to finsh.
8 x / 15 = 1-0.1
x = 0.9 * 15 / 8
x = 1.6875 hours.

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