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Joe and Renee are building a fence. Joe can build the fence alone in 4 hours. If Renee stars helping Joe after he has already worked on the fence for 2 hours, they will finish the fence 90 minutes after she joins him. How long would it take Renee to build the fence alone?

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Answer:

Correction: Renee can build a fence in 12 hours.

Step-by-step explanation:

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