2. Party A and Party B go from place A to place B at the same time, with the speed of 12km for Party A and 9km for Party B.. Line a goes to 15km, go back and get something. So later than b 1 hour, find the distance between a and b? -
Xiaoping and Xiaohong walked from school to the Children's Palace at the same time. Xiaoping walks 20 meters more than Xiaohong every minute. After 30 minutes, Xiaoping returned to school as soon as he arrived at the Children's Palace and met Xiaohong 350 meters away from the Children's Palace. How many meters does Xiaohong walk every minute? -
4. Party A and Party B arrive at 7: 00 a.m., and Party A is 8 kilometers faster than Party B every hour. Party A will return immediately after arriving at location B on 1 1 in the morning and meet Party B at a distance of 24 kilometers from location B. What is the distance between A and B? -
It is known that A and B are 60 kilometers apart. A is located at A, riding from 1 vehicle, and his speed is 15 kilometers per hour. B is in B, driving, and his speed is 45 kilometers per hour.
(1) If they walk towards each other at the same time, how many hours will they meet?
(2) If they go in the opposite direction, Xiao Ming will ride for 0.5 hours first and ask them how many hours they have known each other.
(3) If they go in the same direction at the same time, how many hours will it take B to catch up with A?
(4) If they go in the same direction, how many hours will it take for A to catch up with A after riding a bike 1 hour?
(5) If two people are driving in the same direction, A first rides a bicycle 1 hour, and finds that an important document of his is at B, so he turns around to get it, and B also drives to A. How many hours will A and B meet?
6. Two people, Party A and Party B, are on the 400-meter circular runway and start at the same time. Party A's speed is 6m/s, and Party B's speed is 4m/s. After running several laps, can Party A surpass Otsuichi Circle?
7. Wang Ran Jr. circled on the 400-meter circular runway. Starting from the starting point, he ran for 45 seconds at first, then accelerated by 0.5 m/s, and then ran to the finish line in 20 seconds. He asked Xiao Wang what his initial running speed was.
8. Xiao Zhang rides a bike from place A to place B, and Xiao Ming rides a bike from place B to place A, both of them advance at a constant speed. It is known that they started at 8 o'clock in the morning at the same time. In the morning, 10 is still 36 kilometers apart, and at noon 12 is 36 kilometers apart. Find the distance between a and b.
9. The distance between Station A and bilibili is 300 kilometers. The speed of a local train from Station A to bilibili is 40 kilometers per hour, and the speed of an express train from bilibili to Station A is 80 kilometers per hour. It is known that the local train runs 1.5 hours, and the express train starts. Will the express train meet the local train a few hours after it leaves?
10. Party A and Party B practice long-distance running on a 400-meter circular track at speeds of 200 m/min and 160 m/min respectively. (1) If they run in opposite directions from the same place at the same time, how many minutes will it be before they meet for the third time?
(2) If two people run in the same direction from the same place at the same time, how many minutes after the second meeting?
1 1.a and B are 49 kilometers apart. Someone started from A on foot and walked the whole distance in three stages at different speeds, which took 10 hour. It is known that the speeds of the first section, the second section and the third section are 6 km/h, 4 km/h and 5 km/h respectively, and the total distance of the third section is 15 km. What is the distance between the first paragraph and the third paragraph?
12. Party A and Party B go from place A to place B at the same time, with the speed of Party A12km and that of Party B/9km. Line a goes to 15km, go back and get something. So later than b 1 hour, find the distance between a and b? -
13. Xiaoming went to climb the mountain. It took him 45 minutes to climb the mountain and another 30 minutes to go down the mountain by the same way. The speed of going up the mountain is 9 meters less than that of going down the mountain. What's the speed of going downhill?
14.A and B drive in the same direction from A and B, with a distance of 18km respectively, and B is behind. When A catches up with B, it needs1.5h. Car B travels at a speed of 48km/h, and find the speed of car A. 。
15. Two cars, A and B, drive from A to B at the same time. Car A travels 30 kilometers per hour and car B travels 45 kilometers per hour. Car B leaves two hours before car A, and both cars arrive at B at the same time. Find the distance between a and b.
16. When the plane flies between two cities, it takes 5 hours with the downwind, 6 hours with the headwind, and the wind speed is 24 kilometers per hour. What's the distance between the two cities?