Three painters (Beth, Solana, and Edie), working together, can paint the exterior of a home in 10 hours (h). Solana and Edie together have painted a similar house in 15 h. One day, all three worked on this same kind of house for 4 h, after which Edie left. Beth and Solana required 8 more hours to finish. Assuming no gain or loss in efficiency, how long should it take each person to complete such a job alone?