![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
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?
(480-420) / (30-27) = 20 m / S
20 × 30-480 = 120m
A: the train is 120 meters long and the speed is 20 meters per second
A train runs through two tunnels at the same speed. The first tunnel is 420 meters long, which takes 27 seconds; the second tunnel is 480 meters long, which takes 30 seconds to find out the length of the train
How many meters does the train travel per second
The length of the train is x meters
Then (x + 420) × 27 = (x + 480) × 30
30（X+420)=27(X+480)
30X+12600=27X+12960
3X=360
X=120
The train runs (120 + 420) △ 27 = 20m per second
A train passes a bridge and a tunnel at the same speed. It is known that the bridge length of the bridge is 420 meters, and it takes 27 seconds. The length of the cableway is 480 meters, and it takes 30 seconds. Try to find out the speed of the train and the length of the train
Solve by equation
(-1001)^2009×(0.125)^2008×(-2/7)^2009×(-4/13)^2009×(-1/11)^2009
Let the conductor be X,
The distance to cross the bridge is 420 + X, and the distance to cross the cableway is 480 + X
Then the speed of the train is (420 + x) / 27 or (480 + x) / 30
That is: (420 + x) / 27 = (480 + x) / 30
The solution is: x = 120, (420 + x) / 27 = 20
That is, the length of the train is 120 meters and the speed of the train is 20 meters per second
RELATED INFORMATIONS
- 1. 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
- 2. 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?
- 3. 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
- 4. 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
- 5. 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]
- 6. It takes 24 seconds for the first 360 meter tunnel and 16 seconds for the second 220 meter tunnel
- 7. 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?
- 8. 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?
- 9. There is a railway bridge with a length of 1000 meters. A train passes through the bridge. It takes 120 seconds for the train to get on the bridge and get off the bridge completely. The time for the whole train to be completely on the bridge is 80 seconds. What are the speed and length of the train?
- 10. It takes 52 seconds for a train to pass the 320 meter long tunnel. When it passes the 864 meter long bridge, its speed is 1 / 4 higher than that when it passes the tunnel. As a result, it takes 1 minute and 36 seconds. How long is the train body? The length of the train body? Is it the length of the whole train or just the body?
- 11. 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?
- 12. 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
- 13. 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
- 14. 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
- 15. It takes 20s for a train to pass through a 300m tunnel. The tunnel light shines on the train for 10s. Ask the conductor
- 16. 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)
- 17. 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
- 18. 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?
- 19. 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
- 20. 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?