SOLUTION: Every week Naomi stuffs 1000 envelopes. If she does the job by herself it takes 6 hours. If Jill helps it takes 5 1/2 hours. How long would it take Jill to do the job by herself?

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Question 151890: Every week Naomi stuffs 1000 envelopes. If she does the job by herself it takes 6 hours. If Jill helps it takes 5 1/2 hours. How long would it take Jill to do the job by herself?
Please help me understand how to do the equation. Thank you
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
The formula is N*J/(N+J)=T
6x/(6+x)=5.5
6x=5.5(6+x)
6x=33+5.5x
6x-5.5x=33
.5x=33
x=33/.5
x=66 hours for Jill to do the job alone.