The total length of an expressway is 150 km, the speed of the car is 50 km / h, and the remaining distance after X hours is y km The functional relationship between Y and X is? Help, can ~ ~ ~ sincerely ask for help

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• 1. What is meant by "driving motor vehicles on roads other than expressways and urban expressways without following the prescribed lanes" What are the circumstances of such violation? I hope I can get a specific answer, because I just got punished and I can't remember where I broke the rules
• 2. A 3.5-meter-long car is driving at a speed of 32 meters per second. In front of it is a 16.5-meter-long truck driving in the same direction at a speed of 27 meters per second. How many seconds does it take for the car to catch up with the truck?
• 3. From a to B, the bus had to travel 7 hours. After the opening of the expressway, the average speed increased by 20 kilometers per hour. It only takes 5 hours to get there______ Kilometers
• 4. From the first place to the second place, buses used to take 9 hours. Since the opening of the expressway, the average speed has increased by 40 kilometers per hour, now it only takes 5 hours Hours from a to B. find the distance between a and B
• 5. A car travels 62.5km per hour on an ordinary highway, and the speed on the highway is 90km less than three times the speed on an ordinary highway What's the speed of the car on the highway?
• 6. The speed of a car on the highway is 2km / min, which is four times the speed of a bus. How many meters / min is the speed of this bus? To calculate the formula and answer! If it's fast, you'll offer a reward!
• 7. On the same road, Xiaoming rides in the same direction as Xiaoguang. Xiaoming's speed is three times faster than Xiaoguang's. every 10 minutes a bus overtakes Xiaoguang, and every 20 minutes a bus overtakes Xiaoming. If a bus leaves at the same time from the departure station, then the distance between two adjacent buses is shorter______ Points
• 8. On the scale of 1:2000000, the distance between the two cities is 6cm. What is the actual distance?
• 9. On the map with the scale of 1:2000000, the distance between a and B is 3.6cm. If the car starts from a place at 8 am at the speed of 60km / h, what time is it to arrive at B place?
• 10. On the map with a scale of 1:2000000, the distance between a and B is 18.4cm. The passenger car and the freight car start from a and B at the same time and meet each other in 4 hours. The speed of the passenger car is known to be 40km / h, so the speed of the freight car can be calculated
• 11. Someone rides a motorcycle to work from place a to place B. He has to walk 40 kilometers of flat road, 48 kilometers of uphill road and 36 kilometers of downhill road. His speed on the flat road is per hour 20 km, 2 km faster than 1.2 times the uphill speed, and the downhill speed is 1.6 times the uphill speed. How many hours does it take for him to go back and forth? (can you explain each step clearly?)
• 12. The highway from city a to city B is 160 km long. The speed of a car on the expressway is 80 km / h, and that on the ordinary highway is 40 km / h. how much time does it save to take the expressway from city a to city B?
• 13. The distance between a and B is 90 kilometers. How many kilometers does a car leave B after driving from a to B at the speed of 80 kilometers per hour
• 14. The car starts from the station and runs at a speed of 4m / s along the straight road at a uniform speed. After 2S, a motorcycle starts from the same station and accelerates to catch up The car starts from the station and runs at a speed of 4 m / s along the straight road at a constant speed. After 2 s, a motorcycle starts from the same station and accelerates to catch up with the car with an acceleration of 3 M / S2. How long does it take for the motorcycle to catch up with the car after it starts? How far is it from the starting point when the motorcycle catches up with the car?
• 15. The average speed of the car in the first 10 km is 40 km / h, and the average speed in the last 10 km is 50 km / h
• 16. When a car runs along a straight road, it first passes through the first 3 / 1 displacement at speed V1, and then passes through the other 2 / 3 displacement at speed V2 = 50km / h, If the average velocity of the whole displacement is 37.5km/h, what is the velocity in the first displacement thank you Wrong number on the top. It's 1 / 3 displacement
• 17. The world-famous Hangzhou Bay sea crossing bridge is 36 km long, with a design speed of 100 km / h. Q: the vehicle mass is 5 x 103 kg, and the design speed is uniform on the bridge Hangzhou Bay sea crossing bridge is 36 km long and the design speed is 100 km / h Q: the mass of the car is 5x103kg. When driving at the designed speed on the bridge, the resistance is 0.06 times of the weight of the car. Calculate the power of the car's engine. (G is 10N / kg)
• 18. Party A and Party B set out from ab at the same time and went opposite each other. The speed of car a was 60% faster than that of car B. after the two cars met on the way, they continued to move forward at the original speed When arriving at B, B is 26km away from the midpoint of AB, what is the distance between ab
• 19. The speed ratio of car a to car B is 4:5. The ratio of the time taken by car B to car a to complete the same journey is 4:5______ ．
• 20. If the speed ratio of a and B cars moving in a uniform straight line is 3:4 and the distance ratio is 6:5, then the movement time ratio of the two cars is () A. 9：10B. 5：3C. 5：8D. 8：5