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Question 970271: Working alone, one builder can frame a room addition in 12 hours. Another, more experience builder, can do the same job only in 8 hours. How long would it take them to frame the room addition of they work together? Answer with a complete sentence. Use a mixed number in your answer.
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Working alone, one builder can frame a room addition in 12 hours. Another, more experience builder, can do the same job only in 8 hours. How long would it take them to frame the room addition of they work together?
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One does 1/12 of the job per hour
The other does 1/8 of the job per hour.
Together, they do 1/12 + 1/8 per hour
= 5/24 job/hr
--> 24/5 = 4.8 hours for the job
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