Mr. Li is a doctor. He works at a hospital in Shijiazhuang. In January he wants to go on a trip to Hainan with his wife and son. Hainan is far from Shijiazhuang. It is about 2400 kilometres. They want to take a plane. Because the plane is fast. They leave for Hainan in the morning on January 20 and arrive in Hainan in the evening. They are going to stay in Hainan for seven days, because it is warm in Hainan.
