![](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>)
How long does a 100 meter long train go through a 500 meter long cave at a speed of 72 km / h? Thank you
(500+100)/72=25/3
The 200m long train runs at a constant speed of 43.2km/h on the Beijing Kowloon line. When it crosses the 1000m long tunnel, the time required is______ ．
The distance of the train: S = S1 + S2 = 200m + 1000m = 1200m, the speed of the train: v = 43.2km/h = 12m / S; the time of the train: T = SV = 1200m, 12m / S = 100s; so the answer is: 100s
How long does it take for a 150m long train to cross a 130m long train traveling in the same direction at a speed of 5m / s when it moves at an average speed of 54km / h
How long does it take for a 150m long train to cross a 130m long train traveling in the same direction at a speed of 5m / s with an average speed of 54km / h?
54km / h = 15m / s, with the team as the reference, then the speed of the train is 15-5 = 10m / s, the distance of the train passing through the team is 130 + 150 = 280m, so the required time is 280 / 10 = 28s
A passenger is sitting in a train with a speed of 54 km / h, and a 150 m long freight car with a speed of 36 km / h comes from the parallel track,
How long does it take for the truck to pass the passengers? I don't understand the online method.)
This is a problem of relative speed. As passenger cars and freight cars are running in opposite directions, we can think that the speed of freight cars relative to passengers is (36 + 54) km / h = 90km / h, and the change unit is 90 / 3.6 = 25m / s. therefore, the time for a 150m long freight car to pass passengers should be t = 150 / 25 = 6 seconds
It takes 10 seconds for a 30 meter long train to pass a 70 meter long bridge at a constant speed. If it takes 3 minutes to pass another bridge at the same speed, how long is the bridge?
When the first train crosses the bridge, the total distance is s = 30m + 70m = 100m, and the speed is v-car = st = 100m10s = 10m / s. when the second train crosses the bridge, the total distance is s-bridge + s-car = v-car × T1 = 10m / s × 180s = 1800m. So s-bridge = 1800m-s-car = 1800m-30m = 1770m. A: the bridge is 1770m long
It takes 10 seconds for a 150 m long train to pass through a 90 m long bridge at a uniform speed. The calculation is as follows: (1) the speed of the train. (2) how long does it take for the train to pass through a 1050 m long tunnel at the same speed
(1) V = st = 150m + 90m10s = 24m / s a: the speed of the train is 24m / S; (2) t = SV = 1050m + 150m24m / S = 50s. A: it takes 50 seconds for the train to cross a 1050m long tunnel at the same speed
A car runs at a constant speed and passes a 150 m long iron bridge in 10 seconds. How long does it take for it to pass a 4500 m highway at such a speed?
Given: S1 = 150m, time T1 = 10s, highway length S2 = 4500m, time T2 =? The driving speed of the car is v = s1t1 = 150m10s = 15m / s, ∵ v = st, ∵ the time for the car to pass a 4500m highway is T2 = S2V = 4500m15m / S = 300s. A: it takes 300s for the car to pass a 4500m highway at this speed
How long does it take for a 200m long light rail train to cross a 2.8km overpass at a speed of 15km/s?
From the time when the front of the car arrives at the end of the bridge to the time when the rear of the car leaves the end of the bridge
2.8km=2800m
t=(2800+200)/15=200s
A 200m long train passes through a 1km long train bridge at a speed of 40m / s. how long does it take for the train to get on the bridge and leave the bridge? If the train driver sees himself on the bridge, how long does it take for him to get off the bridge?
If the bridge is 1000 meters long and the train is 200 meters long, the distance from the train on the bridge to the train leaving the bridge is 1000 + 200 = 1200 meters
The speed of the train is 40 m / s, so the time required for the train to pass the bridge is 1200 △ 40 = 30 seconds
When a train driver sees himself on the bridge, the distance he travels from getting off the bridge is 1000 meters
Then the time used is: 1000 △ 40 = 25 seconds
A 200m long train runs at a speed of 14.4km/h and takes 130s to cross a cave. What is the length of the cave?
Cave length: 320 meters
14.4 * (1000 / 3600) * 130-200 = 320m
Let's take it
RELATED INFORMATIONS
- 1. 4. A 200m long train runs at the speed of 36km / h. It takes 100s to pass through a cave. How many meters is the length of the cave
- 2. It takes 30 seconds for a train to cross the 430 meter long railway bridge. If the train speed doubles, It took 50 seconds for it to pass the 2180 meter iron bridge, so what's the length of the train
- 3. A 200m long train takes 45s to cross a 700 long bridge. What is the average speed of the train passing the bridge?
- 4. A train with a length of 300m crosses the bridge at a speed of 36km / h. It is known that it takes 5min for all trains to pass through the bridge, so the bridge length can be calculated rt
- 5. A freight car is running on the straight road at the speed of V1 = 28.8km/h. Due to the wrong scheduling, a passenger car behind it is driving on the same road at the speed of V2 = 72km / h. at the distance of S0 = 600m, the driver of the passenger car immediately stops the truck. In order to avoid collision, at least how much speed should the passenger car speed up?
- 6. 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!
- 7. 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=
- 8. 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?
- 9. 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
- 10. 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?
- 11. Emergency. The length of the train is 200m, the length of the bridge is 1000m, and the train passes through the bridge at a constant speed Emergency. The length of the train is 200m, the length of the bridge is 1000m, and the train passes through the bridge at a constant speed. (1) the time for the train to pass through the bridge? (2) what is the time for the train to finish at the bridge? (3) the time for the train driver to pass through the bridge? Note: This is a physics problem
- 12. When a train passes a bridge at 2160m per minute, the time for the whole train to be completely on the bridge is 2
- 13. For example, how long does it take for a 300m long train to pass through a 1600m tunnel at a speed of 36km / h? How long does the whole train spend in the tunnel?
- 14. How much speed does it take for a train to cross the railway bridge in 160m / S?
- 15. When a railway bridge is 1000m long and a train with length of AM passes through the bridge, the speed of the train is measured to be 1 & nbsp; min from the beginning to the end of the bridge______ ．
- 16. The train is 200 meters long. It takes 20 seconds to cross a 360 meter long bridge from the front to the rear. The train passes a 640 meter long bridge at the same speed A train with a body length of 200 meters passes through a 360 meter long bridge. It takes 20 seconds from the front of the train to the rear of the train. How long does it take for the train to pass through a 640 meter long tunnel at the same speed and enter from the front to the rear?
- 17. It took 60 seconds for the 1260 meter long bridge and 90 seconds for the 2010 meter long tunnel to cross emergency
- 18. The factory sent a car to pick up the factory director from his home on time. One day, the factory director walked to the factory one hour in advance. As a result, on the way to the factory, he met a car sent by the factory, so he arrived at the factory 10 minutes earlier than usual? （60 - 10÷2）÷（10÷2）= 11 My question is: where can I see that the long walking time is 55 minutes? But I still don't understand For example, when I go to work at 9 o'clock, the factory director leaves home at 8 o'clock. After 55 minutes, the factory director meets a car, which is already 8:55. Can the car arrive at the factory 10 minutes ahead of time?
- 19. When A-B / A + B = 4, find the value of 5 (a-b) / A + B + A + B / 2 (a-b) Those who answer will be rewarded
- 20. 1. The first n terms of a sequence and Sn = an ^ 2 + BN + C (a is not equal to 0) Ask (1) the formula an of the sequence; (2) whether the sequence constitutes the arithmetic sequence? 2. It is known that the sum of the first n terms of the sequence {an} is Sn and satisfies A1 = 1 / 2, an + 2snsn-1 = 0 (n > = 2) (1) Judge whether {1 / Sn} is arithmetic sequence and prove that (2) find Sn and an 3. In the natural number set y = f (x), we know that when x = 1, f (x) + F (x + 1) = 5, when x is odd, f (x + 1) - f (x) = 1, when x is even, f (x + 1) - f (3) = 3 (1) Verification: F (1), f (3), f (5) F (2n-1) (n ∈ n) is an arithmetic sequence; (2) Find the analytic expression of: F (x) thx! The third question should be: If x is odd, f (x + 1) - f (x) = 1; if x is even, f (x + 1) - f (x) = 3, and f (1) + F (2) = 5 (1) Prove f (1), f (3) F (2n-1) (n is a positive integer) is an arithmetic sequence (2) Finding the analytic expression of F (x)