SOLUTION: One worker takes 20 hours to do a job. A second worker can do the same job in 15 hours. When a third worker is a added it take the three of them 6 hours to do the job. How long wou

SOLUTION: One worker takes 20 hours to do a job. A second worker can do the same job in 15 hours. When a third worker is a added it take the three of them 6 hours to do the job. How long wou

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Question 847302: One worker takes 20 hours to do a job. A second worker can do the same job in 15 hours. When a third worker is a added it take the three of them 6 hours to do the job. How long would it take the third worker to do the job?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
6/20+6/15+6/x=1
3/10+2/5+6/x=1
3/10+4/10+6/x=1
7/10+6/x=1
6/x=3/10
x=20

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