SOLUTION: An experienced carpenter requires 15 hours to complete a job. An apprentice requires twice as many hours to complete the same job. How long would it take the carpenters, working

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Question 622827: An experienced carpenter requires 15 hours to complete a job. An apprentice requires twice as many hours to complete the same job. How long would it take the carpenters, working together to complete the job?
Answer by Alan3354(30993) About Me  (Show Source):
You can put this solution on YOUR website!
An experienced carpenter requires 15 hours to complete a job. An apprentice requires twice as many hours to complete the same job. How long would it take the carpenters, working together to complete the job?
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c does 1/15 of the job per hour
a does 1/30
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Together, they do 1/15 + 1/30 = 1/10 per hour
--> 10 hours