2. Lu Cheng arrived at school at 7: 59 in the morning at 10 second, and Zhang Lan arrived at school at 7: 59: 38. Which of them got to school first and how early?
3. 100 meter race, Xiaoming is 3 seconds faster than Xiao Fang, and Xiao Fang is 2 seconds slower than Xiao Gang. Can you rank them three?
The present time is 4: 20. What time will it be after 1: 30?
It's 2: 30 in the afternoon, what time was it 40 minutes ago?
6. It takes five seconds for Zhao Ning to dictate a question. How many questions can he dictate in six minutes?
7. How long did it take for students to go for a spring outing, leaving at 8: 20 in the morning and returning at 3: 20 in the afternoon?