My brother and younger brother went to People's Park to see the Chrysanthemum Exhibition. My brother walks 50 meters every minute. After walking 10 minutes, my brother ran after my brother at a speed of 70 meters per minute. Q: How late can my brother catch up with his brother?
3. Xiaohong and Xiaoming traveled westward from the West Village and the East Village respectively. Xiaoming rides a bike every hour 16 kilometers, and Xiaohong walks 5 kilometers every hour. Two hours later, Xiao Ming caught up with Xiaohong and asked how many kilometers there were in Dongxi Village.
A car travels from a to b at a speed of 40 kilometers per hour. Five hours later, a train also traveled from A to B at a speed of 90 kilometers per hour. The train overtook the car at the midpoint between A and B. How many kilometers is there between A and B?
At 6: 30 in the morning, a local train goes from A to B at a speed of 40 kilometers per hour, and another express train goes from A to B at a speed of 56 kilometers per hour at 7: 30 in the morning. The railway department stipulates that the distance between two trains in the same direction shall not be less than 8 kilometers. Then, when should the local train stop at the latest to let the express train pass?
Xiaoyun goes shopping from home at a speed of 40 meters per minute. Five minutes later, Xiaoying went after Xiaoyun and finally caught up with Xiaoyun 600 meters away from home. What is Xiaoying's speed?
7. A group of middle school students went to a certain place for military training. They are advancing at a speed of 5 kilometers per hour. After walking for 6 hours, the school sent Mr. Qin to catch up with the students by bike at a speed of 15 km/h to convey the school notice. How many hours can Teacher Qin catch up with the team? How many roads did the motorcade walk when it caught up?
8. Xiaoming walks to school, walking 70 meters every minute. After leaving home 12 minutes, my father found Xiao Ming's pencil case at home, and immediately rode to find Xiao Ming at a speed of 280 meters per minute. So how many minutes after his father left, he caught up with Xiao Ming?
9. The circular runway is 400 meters long. Xiao Qiang runs 300 meters per minute, and Xiao Xing runs 250 meters per minute. Two people set out for the same place and the same direction at the same time. How long did it take Xiao Qiang to catch up with Xiaoxing for the first time?
10. On the 300-meter-long circular runway, Party A and Party B start from the same point and run in the same direction. Party A runs 9 meters per second and Party B runs 7 meters per second. Now Party B is 0/00 meter behind Party A. Q: How long will it take Party A to catch up with Party B?