SOLUTION: Helen and Dawn, working together, started a job that they could complete in 12 hours, but after 4 hours Helen had to leave. If Dawn could have done the job in 18 hours, how long wi

SOLUTION: Helen and Dawn, working together, started a job that they could complete in 12 hours, but after 4 hours Helen had to leave. If Dawn could have done the job in 18 hours, how long wi

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Question 857595: Helen and Dawn, working together, started a job that they could complete in 12 hours, but after 4 hours Helen had to leave. If Dawn could have done the job in 18 hours, how long will it take her to finish it?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
12/h+12/18=1
h = 36,
4/36+4/18+x/18=1,
1/9 +2/9+x/18=1
1/3+x/18=1
x/18=2/3
x=12
It would take Dawn 12 hours to hours to finish it.

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