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Train a and train B leave from cities a and B along the same railway line. Train a runs 90km per hour and train B runs 110km per hour 12 hours later, the two cars met. On the map with a scale of 1:6000000, how many centimeters is the railway line long? [I don't understand at all. First (90 + 110) divided by 12?]
AB railway line length: (90 + 110) * 12 = 2400 (km)
1km = 100000 cm
So, 2400 km = 240000000 cm
Then calculate according to the scale: 240000000 * 1 / 6000000 = 240 (CM)
So on the map, the railway line is 240 cm long
1. The highway and railway between a and B are parallel. Trains travel 60 kilometers per hour and cars travel 40 kilometers per hour, The train from place a to place B takes 2 hours less than the car. How many kilometers is the distance between place a and place B? 2. The number of male employees in a textile factory is 1 / 3 of the number of female employees. It is known that 380 male employees are less than female employees. How many employees are there in the whole factory?
1. Set X hours for the train from place a to place B and X + 2 hours for the car
The equation 60x = 40 * (x + 2) gives x = 4 hours
Therefore, the distance between Party A and Party B is 60 * 4 = 240 km
2. There are x male employees and 3x female employees
The equation 3x-x = 380 gives x = 190 people
The number of employees in the whole plant is x + 3x = 760
The railway between Party A and Party B is 850 kilometers long. A passenger car and a train leave from the two places at the same time. The passenger car runs 92 kilometers per hour and the train runs 78 kilometers per hour M, after a few hours, the two cars met on the way
850/（92+78）=5
Five hours
The railway between Party A and Party B is 2530 kilometers long, and two trains leave from the two places at the same time. The passenger car runs 120 kilometers per hour, and the freight car runs 120 kilometers per hour On 11 / 12 of the bus, how many hours after the two trains left?
2530 / = 11 hours
The passenger car and freight car run from station a and station B at the same time. The passenger car runs the whole journey in 3 hours, and the freight car runs 60 kilometers per hour How many kilometers is the distance between station a and station B when 72 kilometers meets the bus
The travel time of the bus is the same as that of the truck. 72 / 60 = 1.2 hours
The bus takes 3 hours to complete the whole journey, and the truck takes 3-1.2 = 1.8 hours for 72 kilometers
Then the speed is 72 / 1.8 = 45 kilometers per hour,
The whole journey is 45 * 3 = 135 kilometers
Two cars start from cities a and B at the same time and travel opposite each other. Buses travel 75 kilometers per hour and trucks travel 60 kilometers per hour The meeting place is 30 kilometers away from the midpoint. How many kilometers is the distance between cities a and B? The answer is 540 kilometers. It's better not to set up an equation to calculate the formula. It's really not possible. Thank you for answering my expert: Thank you!
The meeting place is 30 kilometers away from the midpoint. It can be seen that the bus travels 30 * 2 = 60 more than the truck
Therefore, the walking time is 60 / (75-60) = 4 (hours), and the total distance is 4 * (75 + 60) = 540
RELATED INFORMATIONS
- 1. The passenger and freight cars run from Party A and Party B respectively. The passenger car runs 78 kilometers per hour and the freight car runs 60 kilometers per hour. The two cars meet at 18 kilometers from the midpoint of the whole journey. How many kilometers are there in the whole journey?
- 2. A and B are 540 kilometers apart. A bus and a truck leave the two places at the same time. The speed ratio is 5:4. They meet in three hours What are the speeds of passenger cars and trucks?
- 3. Li Yun sat in a train with a speed of 60 kilometers per hour by the window and saw a truck with 30 carriages coming head-on. When the front of the truck passed the window, he began to remember the time. Until the last carriage passed the window, the recorded time was 18 seconds. It is known that each carriage of the truck is 15.8 meters long and the distance between the carriages (including the front) is 1.2 meters, The front of the truck is 10 meters long. What is the speed of the truck?
- 4. An expressway is 336 kilometers long. A passenger car completes the whole journey in 3.2 hours and a truck completes the whole journey in 4.8 hours How fast is the bus faster than the truck?
- 5. The fast and slow trains run opposite each other. The fast train is 50 meters long and the slow train is 80 meters long. The speed of the fast train is twice that of the slow train. If the time for people sitting on the slow train to see the fast train passing through the window is 5 seconds, then the time for people sitting on the fast train to see the slow train passing through the window is 5 seconds______ Seconds
- 6. The two trains run at a uniform speed in the same direction. When they start, the slow train is 60 kilometers in front of the fast train. The speed of the slow train is 2 / 5 of that of the fast train. After driving for half an hour, the fast train catches up with the slow train. Q: what are the speeds of the two trains?
- 7. It takes 80 seconds for a train to pass through a 199 meter long railway bridge, and 72 seconds for it to pass through a 172 meter long tunnel at the same speed?
- 8. A train travels at an average speed. It takes 20s to pass through a 300m long tunnel. There is a lamp on the top of the tunnel, and the time on the train is 10s. Ask for the speed of the train A series of univariate linear equations
- 9. The length of the two trains a and B is 144m and 180m. Car a runs 4m more per second than car B. the two trains run opposite to each other, and it takes 9s from meeting to staggering. What is the speed of the two trains?
- 10. A bus and a truck run in the opposite direction from the same place at the same time, with a distance of 400 kilometers after 4 hours. It is known that the bus travels 58 kilometers per hour, and how many kilometers does the truck travel per hour?
- 11. The railway from Shanghai to Tianjin is 1325 kilometers long. A train from Shanghai to Tianjin has been running for 5 hours, just 2 / 5 of the whole journey. Drive like this and arrive in Tianjin in a few hours? (in two ways)
- 12. The speed of a passenger car is 60 km / h and the speed of a freight car is 45 km / h. The freight car is 135 meters longer than the passenger car. If the two cars run opposite on the parallel track and the time they spend in the process of meeting is 30 seconds, the lengths of the passenger car and the freight car are ___
- 13. The passenger car and the freight car run in the same direction. The passenger car is 150 meters long and the freight car is 250 meters long. If the passenger car speed is twice the freight car speed and less than 20 kilometers, and their passing time is 45 seconds, what are the speeds of the two cars respectively?
- 14. The railway from Nanjing to Changzhou is 138 kilometers long. An express train and a slow train leave from Nanjing and Changzhou at the same time. It is known that the fast train runs 88 kilometers per hour and the two trains meet in one hour. After meeting, how many hours will the slow train travel to Nanjing?
- 15. A bus runs 50 kilometers per hour and a truck runs 55 kilometers per hour. The two cars leave from the two places at the same time. When they meet, the truck travels 7.5 kilometers more than the bus. How many kilometers are the two places apart?
- 16. A train is 200 meters long and passes through a 1800 meter long railway bridge at a speed of 20 meters per second. How long does it take for the train to pass through the bridge? The important thing is the format Both objects of a and B move in a straight line at a uniform speed. The distance a passes through is twice that of B, and the time B moves is 1.5 times that of A. what is the speed ratio of a and B?
- 17. It takes 23 seconds for a train to pass through a 450 meter long bridge and 8 seconds for a worker standing by the railway. What is the speed and length of the train
- 18. How long does it take for a 120cm long train to pass through a 300m long tunnel at the speed of 54
- 19. A train passes through a 900 meter long railway bridge. It takes 1 minute and 25 seconds from the front of the train to the rear of the train. Then the train passes through a 1800 meter long tunnel. It takes 2 minutes and 40 seconds from the front of the train into the tunnel to the rear of the train to leave the tunnel. Calculate the speed of the train and the length of the body
- 20. The two trains come from opposite places of Party A and Party B. passenger cars travel 60 kilometers per hour and freight cars travel 55 kilometers per hour. When two cars meet, passenger cars travel more than freight cars 20 kilometers. What is the distance between Party A and Party B?