The torus doughnut shop makes fresh doughnuts for the first 30 minutes of every two-hour block that they are open, which is for 12 hours a day. douglass knows that the doughnuts taste way better within 15 minutes of baking. douglass gets the munchies and makes a run to buy a dozen doughnuts. what is the probability that he will get there when they are serving doughnuts that he considers fresh?