There are eight railway stations on a railway. If a passenger car has to stop at each station during the round trip, how many kinds of tickets should the Railway Bureau prepare for this line

(7+6+5+4+3+2+1)*2=56

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1. On the railway from station a to station B, there are five stations. How many different fares do you need for the train from station a to station B? How many different tickets do you need to prepare?
2. If the train from a city to B city has to pass through 12 stations, how many different tickets will a prepare for the train Make it clear why
3. How many hard seat tickets do you need to prepare for a full stop train between Beijing and Shanghai at 15 stations?
4. On a section of double track, two trains run in the same direction. The speed of train a is 20 meters per second, and that of train B is 24 meters per second The total length of the train is 180 meters, and the time for train B to catch up with train a to completely exceed train a (i.e. wrong train) is calculated Set up equations to do
5. On a section of double track, two trains run in the same direction. The speed of train a is 20 meters per second, and that of train B is 24 meters per second. If the total length of train a is 180 meters and that of train B is 160 meters, the time taken for train B to completely exceed that of train a (i.e. wrong train) is 30 minutes___
6. In a section of double track railway, two trains pass at the same time, one speed is 20 meters per second, one speed is 24 meters per second, and the length of the train is 180 meters and 160 meters respectively On a section of double track railway, two trains pass by at the same time. The speed of one train is 20 meters per second, the speed of one train is 24 meters per second, and the length of two trains is 180 meters and 160 meters respectively
7. The two trains are both 180 meters long. If the two trains run in opposite directions, it will take 12 seconds from the front to the trunk. If they run in the same direction, it will take 60 seconds from the front of a to the rear of B until the rear of a exceeds the front of B. assuming that the speed of a and B is constant, calculate the respective speed of the two trains
8. When a person is sitting in a car, what does it mean if he sees the scenery moving backward out of the window
9. The length of a and B buses are 150 meters and 200 meters respectively. They are running on parallel tracks. It is known that a passenger on car a has measured that the time for car B to pass outside his window is 10 seconds, so what is the time for the passenger on car B to see car a pass outside his window______ Seconds
10. The length ratio of a and B trains is 4:5. They travel in the same direction. Xiaoming on car a sees that car B has passed from back to front for 20 seconds. How many seconds does Xiaodong on car B see that car B has passed car a?
11. The railway between station a and station B is 1800 km long. At 10:30 pm on September 30, a train runs from station a to station B at a speed of 90 km per hour At 12:00 that night, a train was going from station B to station a at the speed of 95 kilometers per hour. What month, day and hour did the two trains meet
12. The railway between station a and station B is 660 kilometers long. At 10:30 in the morning, a train runs from station a to station B at a speed of 90 kilometers per hour, At the same time, there is a train going from station B to station a at the speed of 75 kilometers per hour. How long can the two trains meet
13. Next to the railway, there is a highway along the direction of the railway. On the highway, a car is running at the speed of 10 meters per second. At this time, a train is running at the speed of 21 meters per second It took 2.5 seconds to drive from the back, from the front to the back, past the car. How long is this train?
14. Next to the railway line, there is a highway along the direction of the railway. On the highway, a tractor is driving at the speed of 20 kilometers per hour. At this time, a 370 meter long fire line is running It took 37 seconds for the train to pass by the tractor from the front to the rear. It was very urgent,
15. A high-speed railway train and a EMU are running from city a to city B. It takes 5 hours for high-speed railway and 7.5 hours for EMU. It is known that the speed of high-speed railway train is higher than that of EMU The speed of high-speed train and the distance between a and B should be calculated
16. Xiaoqiang took the bus at his home to the railway station. After driving 1 / 3 of the distance, he estimated that he would not be able to catch up with the time when the train arrived. So he got off the bus and took a taxi. The speed doubled. As a result, he arrived 5 minutes earlier than only taking the bus and caught up with the train at the railway station. Given that the average speed of the bus is 40 km / h, how far is it from Xiaoqiang's home to the railway station?
17. The two trains were running opposite each other at the same time. The first time they met was 4000 meters away from station a. the two trains were still running at the same speed, and they returned immediately after arriving at the same time Meet at 20 kilometers away from 100 million stations Detailed formula and
18. Two trains start from two stations at the same time. Car a runs 48 kilometers per hour and car B 78 kilometers per hour. After 2.5 hours, the two trains meet. How long is the railway between the two stations?
19. How many years can a city use the first drop of water from each household's tap?
20. If a faucet drips 2 drops per second, try to design an experiment to calculate the water loss in one day and night