SOLUTION: Rose can do a typing job in 5 hours. While Edna can do the job in 7 hours. How long will it take if both of them work together?

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Question 1024703: Rose can do a typing job in 5 hours. While Edna can do the job in 7 hours. How long will it take if both of them work together?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The rates combined for the two typists are additive.

1%2F5%2B1%2F7=7%2F35%2B5%2F35=12%2F35

This rate means TWELVE JOBS in THIRTY FIVE HOURS. You are looking for %2835%2F12%29%28HOURS%2FJOB%29, the time in hours for 1 job.

2 hours 55 minutes