Avery and Charlie go to the same gym every day at various times. Let X = number of hours after 6am when Avery arrives at the gym (e.g., 9am is X = 3), Y = number of hours after 6am when Charlie arrives. 6p-21-3y x20,y20 The joint density function for X and Y is f(x, y) = 0 otherwise Set up a double integral (do not evaluate) to find P(2X 0)