SOLUTION: Janice can encode a report twice as fast as Yobbie. If both girls are working together,they can finish the report in 5 hrs. In how many hrs. can Yobbie encode the entire report if

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Question 377466: Janice can encode a report twice as fast as Yobbie. If both girls are working together,they can finish the report in 5 hrs. In how many hrs. can Yobbie encode the entire report if she works alone?


Pls. answer this..
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
let y = # hours by Yobbie, and j = #hrs by Janice.
y = 2j, and 5%281%2Fj+%2B+1%2F%282j%29%29+=+1. Then 1%2Fj++%2B0.5%2Fj+=+0.20.
1.5%2Fj+=+0.20, or j = 7.5 hrs, for Janice. Yobbie can finish in 2*7.5 = 15 hours.