First, put two pieces of bread into the toaster and bake one side at the same time for 6 seconds (3+3=6) for 30 seconds. It takes three seconds to kill one of them. It takes 2 seconds to turn the other piece over. Then put the uncooked piece in the baking machine for 30 seconds. It takes three seconds to take a piece of bread baked on both sides in the middle to the plate. It takes 3 seconds to put a piece of bread baked on one side of the plate into the toaster. Turn the other piece of bread upside down and bake for 2 seconds and 30 seconds. It takes 6 seconds (3+3=6) to take two pieces of bread to the plate.