SOLUTION: An experienced roofer can roof a house in 26 hours. A beginning roofer needs 39 hours to complete the same job. How long does it take to do the job if the two work together?

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Question 200412: An experienced roofer can roof a house in 26 hours. A beginning roofer needs 39 hours to complete the same job. How long does it take to do the job if the two work together?
Answer by solver91311(24713) About Me  (Show Source):
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If A can do a job in x time periods, then A can do of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do of the job in 1 time period.

So, working together, they can do



of the job in 1 time period.

Therefore, they can do the whole job in:



time periods.


John