2. A class lasts 40 minutes, starting at 8: 30 and ending at what time?
3. Mr. Wang arrived at school at 7: 30 in the morning and got off work at 1 1: 30. What time did he arrive at school in the morning?
It took Beibei 50 minutes to do her homework, which was just finished at 8 pm. When did Beibei start doing her homework at night?
5. The manufacturing of parts began at 7: 40am and was completed at 9: 20am. How long did it take to make this part?
6. The clock at Xiaoling's house has stopped. When the radio broadcast was at 2 o'clock, grandma synchronized with the radio. Because of her age, she turned the hour hand and the minute hand upside down. When Xiaoling came home from school, it was only 2 o'clock sharp. What time should it be now?
7. Xiao Wang went to a shop by bike. He started at 8: 00 a.m. and stopped for 15 minutes on the way. He didn't arrive at a until noon 12. How long did Xiao Wang go by bike?
At 8.5 o'clock, the clock rang five times and it took eight seconds. How many times did it ring at 12?
It takes Xiaoqi 8 minutes to run from home to school. If you leave when you go, you need 10 points to run when you come back. How many minutes does Xiaoqi need to walk back and forth?
10, do homework in winter and winter, write Chinese homework in half of the specified time, and write math homework in part of the remaining time.
Half, the last five minutes of reading, how long did it take Dong Dong to finish all the homework?
1 1. A snail climbed up from the bottom of a ditch 20 cm deep. It takes 2 minutes to climb 4 cm, and then stop at 1. How long does it take for snails to climb from the bottom of the ditch to the side of the ditch?
12. Mingming's clock rings at one o'clock, twice at two o'clock, three times at three o'clock and eight times at eight o'clock. I heard the clock ring once, then again, and then again. Do you know when was the last time?
13, Xiaohong left home at 7:20? Preview after school and start class in 20 minutes? Class ends at 8:40? 40 minutes per class? How long does it take from Xiaohong's home to school?
14, draw 4 pictures per hour? Since 8: 00? 00 to 10:40, with a break 10 minutes? Ask Xiao Ming how many paintings he can draw these days.
15, Xiaogang walks from home to the library at the speed of 1 km per hour? Half an hour after departure, you go back to get your library card? It finally took * * * 2: 30 minutes to get to the library? How far is it from home to the library?