SOLUTION: Joe and Al work together for 4 hours to fix a car. If joe works alone, he can fix the car in 6 hours. How long will it take Al to fix the car by himself?
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-> SOLUTION: Joe and Al work together for 4 hours to fix a car. If joe works alone, he can fix the car in 6 hours. How long will it take Al to fix the car by himself?
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Question 1111315: Joe and Al work together for 4 hours to fix a car. If joe works alone, he can fix the car in 6 hours. How long will it take Al to fix the car by himself? Answer by ikleyn(52769) (Show Source):
Working together, they do of the job per hour.
Working alone, Joe does of the job per hour.
Hence, Al does - = - = of the work per hour.
It means Al needs 12 hours to complete the job working alone.
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It is a typical joint work problem.
