Four children are playing two video games. The first game, which takes an average of 5 minutes to play, is not very exciting, so when a child completes a turn on it he always stands in line to play the other one. The second one, which takes an average of 10 minutes, is more interesting so when they are done they will get back in line to play it with probability 1/2 or go to the other machine with probability 1/2. Assuming that the turns take an exponentially distributed amount of time, find the utilization of both games