There is a railway bridge with a length of 1000 meters. A train passes through the bridge. It is measured that 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 respectively?

There is a railway bridge with a length of 1000 meters. A train passes through the bridge. It is measured that 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 respectively?

Set the train speed as x m / s and the body length as y m, and list the equations
120x=1000+y，①，
80x=1000-y，②，
According to ① and ②, x = 10m, y = 200m,
A: the speed and length of this train are 10m / s and 200m respectively

It is known that a railway bridge is 500 meters long. It takes 30 seconds for the train to cross the bridge. The whole train is completely on the bridge for 2O seconds. Calculate the train speed and length

If the length of the train is x m, then: (500 + x) / 30 = (500-x) / 20 can get x = 100 m, speed: (500 + 100) / 30 = 20 m / s

[a complete process in two steps] it is known that a railway is 800 meters long and a train passes through the bridge. It is measured that the train shares 4 hours from the beginning of getting on the bridge to completely crossing the bridge It is known that a railway is 800 meters long, and a train passes through the bridge. It is measured that the train takes 45s from the beginning to the complete crossing of the bridge. The time for the whole train to be completely on the bridge is 35S. Calculate the speed and length of the train

It should be like this
The distance from the beginning of the train on the bridge to the complete crossing of the bridge should be the length of the bridge plus the length of the train
The length of the bridge minus the length of the vehicle should be the distance that should be traveled completely on the bridge
Then let's set the length of the car as X and the speed as y to list the equations
800+x=45y
800-x=35y
Finally, the equations x = 100 and y = 20 are solved

It is known that a railway bridge is 800 meters long. It is measured that it takes 45 seconds for the train to cross the bridge completely. The time for the whole train to be completely on the bridge is 35 seconds Second. Find the speed and length of the train

Set the train speed as x m / s and the train length as y M
45X=800+Y
35X=800-Y
The solution is x = 20, y = 100
The train speed is 20m / s and the train length is 100m

It is known that a railway bridge is 800 meters long. There is a train passing through the bridge. It is measured that it takes 45 seconds for the train to cross the bridge completely. The time for the whole train to be completely on the bridge is 35 seconds. What is the speed and length of the train?

Set the speed of the train as x m / s and the length of the train as y M
be
45x＝800+y
35x＝800−y ，
Add the two equations to get: 80x = 1600,
∴x=20，
Substitute x = 20 into y = 100,
∴
x＝20
y＝100 ．
A: the speed of the train is 20 m / s and the length is 100 m

It is known that a railway bridge is 800 meters long. Now a train passes through. It is measured that the train takes 45 seconds from starting to get on the bridge to getting off the bridge completely. The time of the whole train on the bridge is 35 seconds, find the length and speed of the train

It is assumed that the train is x meters long and the speed is y meters / second
45y=800+x
35y=800-x
(enclosed in braces)
x=100 y=20
Answer: the train is 100 meters long and the speed is 20 meters / second