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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?
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? (200 + 1800) / 20 = 100 seconds. Both objects 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. then what is the speed ratio of a and B? Known s
How long does it take for a 150m long train to pass through the main bridge of the 1577m Nanjing Yangtze River Bridge at a constant speed of 15 meters per second?
When passing completely, the distance traveled by the front is 1577 + 150, and 150 is the body length
So the time is:
(1577 + 150) / 15 = 116 seconds
The Xiachen railway of Nanjing Yangtze River Bridge has a total length of 6772 meters, including 1572 meters of Zhengqiao on the river and 482 meters of yilie. It takes 100s to pass through the main bridge It takes a long time for the train to pass the bridge
The main bridge on the river is 1572 meters long, and the 482 meter train passes through the main bridge for 100 seconds
The speed of that train is (1572 + 482) / 100 = 20.54 M / s
It takes a long time for the train to pass through the bridge. I don't understand what you mean by the bridge. If it is to pass through "Xiachen railway, the total length is 6772 meters"
That is (6772 + 482) / 20.54 = 353.2 seconds
If you say crossing the bridge is Xiachen railway + River Bridge, that's it
(1572 + 6772 + 482) / 20.54 = 429.7 seconds
Pure hand fight! Hope to adopt
How many seconds does it take for a 150m train to pass through the main bridge of Nanjing Yangtze River Bridge with a total length of 1577 m at a constant speed of 15 m / S It's best to have a problem-solving process. OK, I'll add points!
Because the train itself has length, the distance it passes completely is the length of the bridge plus the length of the train
Known: S1 = 150m, S2 = 1577m, v = 15m / s
Ask: T =?
s=s1+s2=150m+1577m=1727m
According to the formula: v = s / T: T = s / v = 1727m / 15m / s ≈≈ 115.13s
A: the time required is about 115.13 seconds
The main bridge of Nanjing Yangtze River Bridge is 1660 meters long. A 250 meter long train runs at a constant speed. The time to pass through the main bridge is 3min5s. Find the time when the train runs on the bridge
S = l-car + l-bridge = 250m + 1660m = 1910m (calculate the total distance traveled by the car) v = s / T = 1910m / 3min5s ≈ 10.3m/s (calculate the speed of the car) s' = l-bridge-l-car = 1660m-250m = 1410m (calculate the distance traveled by the car completely on the bridge) t '= s' / v = 1410m / 10.3m/s ≈ 136.9s (calculate the time when the car is completely on the bridge) final answer
The distance between Party A and Party B is 450 kilometers. A truck and a bus run from the two places. The truck runs 65 kilometers per hour and the bus runs 55 kilometers per hour, So how many hours will the two cars meet? (solved by equation)
It is assumed that the two vehicles will meet in X hours
（65+55）x=450
120x=450
x=450÷120
x=3.75
Answer: the two cars will meet in 3.75 hours
RELATED INFORMATIONS
- 1. 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?
- 2. 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?
- 3. 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?
- 4. 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 ___
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- 7. 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?
- 8. 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?
- 9. 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?
- 10. 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?
- 11. 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
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- 13. 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
- 14. 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?
- 15. It takes more than 10 seconds for a 72 meter long train to catch up with a 108 meter long truck. If the truck speed is 1.4 times the original, it takes 15 seconds for the train to catch up with and exceed the truck How many meters per second is the speed of the truck? To calculate, think! No equations!
- 16. A passenger and freight car and a freight train run on two parallel tracks respectively, with a passenger car of 150m and a train of 250m Weak 2 trains run towards each other and leave the supply and demand for 10s from the corner of the front to the rear. If the passenger and freight vehicles catch up with the freight train from the rear, it takes 100s from the front to the rear of the freight train to completely exceed the freight train, try to find the speed of 2 trains
- 17. The speed of the freight car is 75% of that of the passenger car. The freight car and the passenger car run towards each other from a and B at the same time, and meet each other after 3 hours. The ratio of the distance between the freight car and the passenger car is __: __
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- 19. As shown in the figure, a railway bridge is 400m long. A person walks on the bridge. When he walks 190m away from the bridge head in front, he finds a train coming in the face. The train speed is 40m / s and the train is 800m away from the bridge head in front. How fast can the person run at least to leave the railway bridge safely?
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