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OpenStudy (anonymous):
A group of college students is volunteering for Help the Homeless during their spring break. They are putting the finishing touches on a house they built. Working alone, Katalin can paint a certain room in 8 hours. Lena can paint the same room in 7 hours. Identify the equation that can be used to find how long it will take them working together to paint the room. How many hours will it take them to paint the room?
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