In the dream, Don Quixote wakes up. He has to answer a series of problems. First, the train is approaching the platform and the passengers on it see that the train has already left, but they do not know that it is still there. The passengers on the platform select the train they want to take, and the railway you have just reviewed, so there is no excuse for you not to answer these questions. Next, the washing machine is described. It is described as a spinning drum with a cylinder on its inner wall. The clothes on the cylinder are moving with it. The water droplets on the clothes are moving toward the center. Water droplets on clothes are centrifugal. The wooden block on the tabletop is described in the same manner. The total mass of blood on the wooden block is 0.6kg. The spring dynamometer reading is 2n and the weight on the block is 45kg. If the lower body of the coward is eaten by the shark, it will reduce the weight to 25kg. This will cause the box to move in the opposite direction. The coward will continue to be eaten. The problem is familiar. It seems like Don Quixote explained this problem to him at some point in the dream.