I go to the library by taxi.
According to the information in the picture, Xiaoming's home is 2000 meters away from the department store, the department store is 2000 meters away from the Agricultural Bank of China, and the Agricultural Bank is 2000 meters away from the library 1500 meters away. Xiaoming takes a taxi from home to the library, 2000+1500+1500 = 5000 meters = 5 kilometers. Ticket price: 9+2×(5-3)= 13 (RMB)