At the same time, the bus and the freight car leave from AB for 5 hours, and then the two cars go on for 3 hours. At this time, the bus is 180 meters away from B, and the freight car is 210 meters away from a A passenger car and a freight car leave from ab at the same time and meet each other in 5 hours. After meeting, the two cars continue to move forward for 3 hours. At this time, the passenger car is 180 kilometers away from B and the freight car is 210 kilometers away from A. how many kilometers is the distance between AB and ab? To process and detailed description, urgent need!!!!!!!!!!

nine hundred and seventy-five

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1. The passenger car and the freight car leave from a and B and meet each other in 5 hours. The latter two cars run for 3 hours respectively. The passenger car is 180 km away from B and the freight car is 210 km away from a A. B how many kilometers are there? Is that ok? Suppose the speed of the bus is x, the train is 5x + 5Y = 8x + 180, and the train is 5x + 5Y = 8y + 210
2. A passenger car and a freight car leave from a and B at the same time. After six hours of meeting, the two cars continue to move forward at the same speed. After four hours of bus B, the freight car is 188 kilometers away from A. how many kilometers is the distance between AB and a?
3. A bus and a freight car leave from ab at the same time and meet each other after 8 hours A passenger car and a freight car leave from ab at the same time. After 6 hours of meeting, both cars continue to move at the same speed. After 4 hours, the passenger car arrives at B. at this time, the freight car is 188 kilometers away from A. how many kilometers is the distance between a and B
4. It takes 8 hours for the passenger car to complete the whole journey, and 12 hours for the freight car to complete the whole journey. When the two cars meet, they are separated from each other in the whole journey At 1:20 a.m., the bus was 260 meters long. How many kilometers are there between a and B?
5. It takes 6 hours for a bus to travel and 8 hours for a truck to complete the whole journey. When the two cars meet, it's just the distance between a and B Please write down the reason for the last step in detail. It's best to solve it in a few minutes
6. After the meeting, the two cars were still moving at the same speed. When they were 196 kilometers apart, the bus stopped running 3-5, 80% of the freight cars in the whole process How many hours does the complete journey take
7. In response to the school's "energy conservation and environmental protection" initiative, Xiao Lin changed to go to school by bike instead of by bus. The distance between Xiao Lin's home and school is 3km, and he can get to school by bike in 10min? (2) If the average resistance of the bicycle is 80N, how much work has he done to overcome the resistance during this period of riding?
8. Xiaohong has measured that her average walking speed is 1.2m/s, km / h; her home is 720m away from the school, so she has to walk at least 20 minutes in advance to avoid being late Xiaohong has measured that her average walking speed is 1.2m/s, km / h; her home is 720m away from school, so she has to leave home at least min in advance to avoid being late
9. Xiao Ming walks home at the speed of 4 kilometers per hour along a bus route after school. Along the way, one bus overtakes him from behind every 9 minutes, and another bus comes face to face every 7 minutes. If the bus keeps running at the same speed at the same time interval, the bus will run at the same time interval______ Give out a car
10. Three hours after the truck left the station at a speed of 30 km / h, a motorcycle chased the truck at a speed of 50 km / h. how many hours can I catch up with the truck?
11. The distance between city a and city B is 480 meters. A truck and a bus meet 4 hours after driving from city a and city B respectively. The speed ratio of truck and bus is 3:5 What are the speeds of freight cars and passenger cars?
12. On the map with a scale of 1:6000000, the distance between AB and ab is 15cm, and the two vehicles start from each other at the same time, I want to meet you in six hours. It is known that the speed of car a is seven eighths of that of car B. how many kilometers does car a travel per hour
13. Car a and car B go from a and B at the same time. After six hours of meeting, car a goes to B for another four hours. Q: how many hours did car B go to a after meeting?
14. A bus stops every 5 minutes. A passenger needs to wait for 0 to 5 minutes after arriving at the bus stop. How about the probability of waiting no more than 3 minutes?
15. If a car with a speed of 80 km / h collides head-on with a car with a speed of 40 km / h, then a car () A. Car a collides with car B. car B collides with car a first. Car a collides with car B at the same time
16. There are three routes leading to different places in a bus station. The first route starts every 15 minutes, the second route starts every 20 minutes, and the third route starts every 50 minutes. After the three routes start at the same time, how long does it take to start at the same time?
17. An express train and a local train run from a and B at the same time and meet each other 4 hours later. It is known that it takes 7 hours for the express train to complete the whole journey, 17 kilometers more than the local train per hour. How many kilometers can the express train run per hour?
18. It is known that it takes 12.5 hours for the local train to go from place B to place a, and it takes half an hour for the local train to return to place a, and it takes one hour for the express train to return to place B. how long does it take for the two trains to meet each other from the first time to the second time?
19. It takes 5 hours for an express train to go from station a to station B, and 8 hours for a local train to go from station B to station a. the express train starts 2 hours before the local train starts. The two trains meet How many hours did the express run? A project is completed in 30 days by Party A alone and 20 days by Party B alone. Now it is completed in 18 days by Party A and Party B. after a four-day break, how many days does Party A have?
20. An express train and a local train start from a and B at the same time. They run in opposite directions and meet each other in 5 hours. After meeting, the two trains continue to run for 3 hours. This is the express train There is 12% of the whole distance from B, and the local train runs 648 kilometers. How many kilometers is the distance between a and B? It's urgent