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It takes six seconds for a train to pass by a power pole on the side of the road. It takes 46 seconds for a train to cross a 2000 meter long bridge at the same speed. How long is the train
The length of the train is x meters
x/6=(x+2000)/46
x=300m
It takes 40 seconds for a train to cross a 440 meter bridge and 30 seconds to cross a 310 meter tunnel at the same speed. What's the speed of the train? It depends on the process and formula
Because when a train passes through a tunnel or bridge, the distance it passes is the length of the tunnel or bridge plus the length of the train itself, because the length of the train will not change, so the time used is different because the length of the tunnel and bridge is different, so it's not necessary to change
It takes 40-30 seconds to get through the bridge than it takes to get through the tunnel
The bridge is 440-310 = 130 (m) longer than the tunnel
So the speed of the train is 130 / 10 = 13 meters per second
It took 24 seconds for a train to pass through the first tunnel of 360m, followed by a second tunnel with the same speed and 216 meters too long, which took 16 seconds. This train and another train
Another train is 75 meters long and 86.4km per hour
Let the length of this train be x m (x + 360) / 24 = (x + 216) / 162 (x + 360) = 3 (x + 216) 2x + 720 = 3x + 648, x = 72, its speed = (72 + 360) / 24 = 18 m / s, the long speed of the other train is 86.4km = 86.4 * 1000 / 3600 = 24 m / s, the passing time of two trains = (72 + 75) / (18 + 24)
Practical questions (12 14:33:33)
There are 108 hectares of forest farm and 54 hectares of pasture in a farm. In order to cultivate a kind of fruit, it is necessary to change part of the pasture into a forest farm, so that the pasture area only accounts for 20% of the forest farm area. How many hectares of pasture area need to be changed into a forest farm
If the area to be changed is x, then
(54-X)/(108+X)=20%
x=27
Practical questions (3 19:14:29)
The time required for a ship to sail 21 km upstream is 1.5 times that for a ship to sail 22 km downstream
Let v be the speed of a ship in still water
21/(V-4)=21/(V+4)+1.5
Just get v
A 200 meter long train passes through a 300 meter long tunnel at a speed of 10 meters per second. How long does it take from the front of the train to the rear of the train?
(200 + 300) / 10 = 50 (seconds)
It took 60 seconds for a train to cross the 1260 meter bridge and 90 seconds for a train to cross the 2010 meter tunnel. How fast is the train? How long is the train?
Length XM, (1260 + x) / 60 = (2010 + x) / 90,
X = 240m, train speed (1260 + 240) * 60 / 1000 = 90km / h
It took 60 seconds for a train to cross a 1260 meter long bridge, and 90 seconds for it to cross a 2010 meter long tunnel at the same speed. What is the speed and length of the train?
Speed (2010-1260) △ 90-60) = 750 △ 30 = 25m / s vehicle length 60x25-1260 = 1500-1260 = 240m
RELATED INFORMATIONS
- 1. It took 24 seconds for a train to pass through the first tunnel with a length of 360 meters, and then it took 16 seconds to pass through the second tunnel with a length of 216 meters. This train is facing another train with a length of 75 meters and a speed of 86.4 kilometers per hour. What is the time for the wrong train to cross?
- 2. A train passes through two tunnels at the same speed. The first 420 meters takes 27 seconds, and the second 480 meters takes 30 seconds?
- 3. Grade 5 math problem: a train passes through two tunnels at the same speed. One tunnel is 420 meters long and runs for 27 seconds. The other tunnel is 480 meters long and runs for 30 seconds How long is the train
- 4. A 240 meter long train passes through an 881 meter long tunnel at a speed of 1500 meters per minute. How many minutes does it take from the front of the train to the rear of the train to leave the tunnel?
- 5. A train passes through a 450 meter long tunnel at a speed of 18 meters per second. It takes 35 seconds from the front of the train entering the tunnel to the rear of the train leaving the tunnel to calculate the length of the train
- 6. A train through the tunnel, from the front into the tunnel to the rear out of the tunnel takes 1 minute and 30 seconds, the known speed of the train is 100 km
- 7. It takes 50 seconds for a 1000m bridge and 70 seconds for a 1500m bridge. If the speed of the train is reduced by 20%, how much does it take for the train to pass through the 1950m long tunnel [solve with the equation of one variable and one degree]
- 8. It takes 24 seconds for the first 360 meter tunnel and 16 seconds for the second 220 meter tunnel
- 9. A train runs 18 kilometers per second, this train runs 1 minute 33 seconds, the whole train passes a 1498 meter long bridge, how long is this train?
- 10. A train is 180 meters long, 20 meters per second. How long does it take for the train to cross the 320 meter long bridge?
- 11. It takes 56 seconds for a train to pass a 240 meter bridge, and 48 seconds for a train to pass a 144 meter tunnel at the same speed There are detailed formulas
- 12. When a train enters a 300m long tunnel, it takes 20s from entering the tunnel to leaving completely. The time for the train to be completely in the tunnel is 10s
- 13. It takes 20s for a train to pass through a 300m tunnel. The tunnel light shines on the train for 10s. Ask the conductor
- 14. A train runs at a speed of 72km / h, and there is a tunnel directly in front of it. The train must whistle before entering the tunnel. The driver hears the echo reflected from the cliff at the tunnel entrance after 1.5s. How far is the driver from the tunnel when he hears the echo? (sound speed is 340m / s)
- 15. Wang Xiaoya was riding on a 200m long train with a speed of 72km / h. from the window, she could see the train running head-on Wang Xiaoya was riding on a 200m long train running at a constant speed of 72km / h. from the window, she saw a 300m long freight train coming in front of her. The passing time was 10s, so she calculated the speed of the freight train
- 16. A train is 200 meters long and has to pass through a 300 meter long tunnel. How many meters does the train travel from the front to the rear of the train?
- 17. A train runs at a constant speed through a 500m long tunnel, If it takes 30 seconds for the train to enter the tunnel and leave the tunnel completely, and the time for the whole train to be in the tunnel is 20 seconds, the length of the train can be calculated Using equation
- 18. It took 50 seconds for a train to pass through a 1140 meter long bridge (from the front of the train to the rear of the train leaving the bridge), and 80 seconds for the train to pass through a 1980 meter long tunnel?
- 19. A certain section of railway is made up of L-length rails one by one. When a train is moving at a constant speed, a passenger in the train needs to measure the speed of the train. He has measured that the time interval of N consecutive vibrations when the train passes through the rail joint is t, then the relationship V of the speed V is calculated=
- 20. On the double track railway, there are two fast and slow trains, both 250m long, running in the same direction at the speed of 50km / h and 45km / h respectively How much time do they overtake? Use the system of linear equations with one variable to solve!