Three painters, beth, bill, and edie, working together, can paint the exterior of a home in 1212 hours. bill and edie together have painted a similar house in 1515 hours. one day, all three worked on this same kind of house for 1010 hours, after which edie left. beth and bill required 55 more hours to finish. assuming no gain or loss in efficiency, how long should it take each person to complete such a job alone?