SOLUTION: It takes Ralph 12 hours to paint a fence alone. Lisa can do the same job in 14 hours. If Ralph paints alone for 35 minutes before Lisa begins helping, how long must they work toget
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Question 854357: It takes Ralph 12 hours to paint a fence alone. Lisa can do the same job in 14 hours. If Ralph paints alone for 35 minutes before Lisa begins helping, how long must they work together to finish painting the fence? Give your answer as a simplified fraction.
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http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Rate-of-work-word-problems.faq.question.854340.html
