When a train passes a bridge at 2160m per minute, the time for the whole train to be completely on the bridge is 2

When a train passes a bridge at 2160m per minute, the time for the whole train to be completely on the bridge is 2

Conductor = 5680-2160 * 2.5-
=5680-5400
=280m

A 150 meter long train, through a 105 meter long bridge, takes 12 seconds, the speed of the train is______ m/s．

According to the meaning of the question, the distance of the train completely passing the bridge is s = 150m + 105m = 255m, t = 12s. Then the speed of the train is v = st = 255m12s = 21.25m/s

A 20 m long train passes through a 980 m long railway bridge at a speed of 36 km / h. how many seconds does it take for the train to cross the bridge?

The distance of the train is s = 20m + 980m = 1000m, the speed is v = 36km / h = 10m / s, the crossing time of the train is t = SV = 1000m, 10m / S = 100s; answer: the crossing time of the train is 100s

How long does it take for a 20 meter long train to pass the 40 meter long railway bridge at a speed of 36 km / h?

According to the meaning of the title, the distance that the train passes through the railway bridge: S = 20m + 40m = 60m; the known speed of the train is 36km / h = 10m / s, according to v = st, the time required for the train to pass through the railway bridge: T = SV = 60m, 10m / S = 6S. A: the time required for the train to pass through the railway bridge is 6S

The 20 meter long train passes through a 40 meter long iron bridge at a speed of 36 km / h,
How long does it take for the car to pass through and how long does it take for the car to be on the bridge?
S =, t =, v = (write whatever conditions you have)

（1）
(40 + 20) / (36 * 1000 / 3600) = 6 seconds
（2）
(40-20) / (36 * 1000 / 3600) = 2 seconds
PS：
1. It's better to standardize the format!
2. Because the distance is short, the speed is reduced to m / s

How long does it take for a 200 meter long train to pass a 400 meter long railway bridge at a speed of 12 m / S

(400 + 200) △ 12 = 50 seconds
Note: 200 car length
400 long railway bridge
12 Speed
50 passage time

A train is 200 meters long. It passes a bridge at the speed of 1200 meters per minute. It takes two minutes from the front of the train to the rear of the train to leave the bridge
A.1200×2-200 B.1200×2+200 C.（1200+200）×2 D.（1200-200）×2
Great Xia, help me

Answer a
It takes two minutes from the front of the car to the rear of the car
Then the car is equal to the total length of the bridge plus the length of the car
So we use 2x speed of 1200 m / min to get the distance minus the length of 200 m
That's the length of the bridge
Can baidu leave me a message

It took 115 seconds for a motorcade to slowly cross a 200 meter long bridge at a speed of 4 meters per second. It is known that each vehicle is 5 meters long and the distance between two adjacent vehicles is 10 meters. Q: how many vehicles are there in this motorcade?

The length of the motorcade is: 4 × 115-200 = 460-200, = 260 (m); suppose there are x cars in the motorcade, we can get the equation: 5x + (x-1) × 10 = 260 & nbsp; & nbsp; & nbsp; 5x + 10x-10 = 260, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 15x = 270, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 18; a: there are 18 cars in the motorcade

When the train passes through a 900 meter long railway bridge, it takes 1 minute and 25 seconds to leave the bridge from the front to the rear, and then the train passes through a 1800 meter long tunnel. It takes 2 minutes and 40 seconds from the front to the rear to leave the tunnel, so the body of the train is as follows
A120m B100 C80 D90
Excuse me: is the actual distance of the train one car body long or two car bodies long?

Let the train body be x meters,
(x+900)/(1+25/60)=(x+1800)/(2+40/60)
x=120
The body of the train is 120 meters
The actual distance of the train is 1 car body length + the length of the railway bridge

A child observes that it takes 8 seconds for a 200 meter long train to pass him, but it takes one minute to pass a railway beside him. Can you calculate the length of the railway bridge?
Comprehensive formula

200 divided by 8 = 25m (train speed)
1 minute = 60 seconds
25 by 60 = 1500 meters
1500-200 = 1300 m (length of railway bridge)