Painting a House Three painters (Beth, Bill, and Edie),working together, can paint the exterior of a home in10 hours (h). Bill and Edie together have painted asimilar house in 15 h. One day, all three worked on thissame kind of house for 4 h, after which Edie left. Beth andBill required 8 more hours to finish. Assuming no gain orloss in efficiency, how long should it take each person tocomplete such a job alone?

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