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Jeff and Kirk can build a75-ft retaining wall together in 9 hours. Because Jeff has moreexperience, he could build the wall by himself 1 hour

Jeff and Kirk can build a75-ft retaining wall together in 9 hours. Because Jeff has moreexperience, he could build the wall by himself 1hour quicker than Kirk. How long would it take Kirk(to the nearestminute) to build the wall byhimself?

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