John, rick, and molli can paint a room working together in 6 hours. alone, john can paint the room in 12 hours. if rick works alone, he can paint the room in 15 hours. write an equation comparing the group rate to the sum of the individual rates. then find how long it will take molli to paint the room if working alone. a.) what is the equation? b.) what is the lowest common denominator for the equation in part a? c.) show all work below in solving the equation from part a. d.) how many hours would it take molli to paint the room if she worked by herself?i really need on this.