5 1 class, Zhao Ming, Sun Yong and Li Jia, three students arrive at the school doctor's office at the same time, waiting for the school doctor to treat Zhao Ming. The injection costs five points.
The school doctor should treat the patient with the shortest treatment time first and the patient with the longest treatment time last, so that the total time for the three students to stay in the clinic is the shortest. In this way, the total time for the three students to stay in the clinic is: Li Jia 1 minute, Zhao 1+3=4 minutes, and Zhao Ming 1+3+5=9 minutes.