SOLUTION: Len can complete a job in 3 hours and Dan can complete the same job in 2 hours. How long will it take the two of them working together to complete the job?

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Question 571685:
Len can complete a job in 3 hours and Dan can complete the same job in 2 hours. How long will it take the two of them working together to complete the job?
Found 2 solutions by septimus99, Alan3354:
Answer by septimus99(4) (Show Source):
You can put this solution on YOUR website!
2 hours. This is a trick question and thats why it seems hard.
-Abby

Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
Len can complete a job in 3 hours and Dan can complete the same job in 2 hours. How long will it take the two of them working together to complete the job?
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Len does 1/3 of the job per hour.
Dan does 1/2 per hour.
Together, they do 1/3 + 1/2 per hour = 5/6 per hour
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5/6 job per hour --> 6/5 hours per job
= 1.2 hours