It took 60 seconds for the 1260 meter long bridge and 90 seconds for the 2010 meter long tunnel to cross emergency

It took 60 seconds for the 1260 meter long bridge and 90 seconds for the 2010 meter long tunnel to cross emergency

Let the train be x meters long and Y meters per second
(1260 + x) / 60 = vehicle speed y = (2010 + x) / 90
The solution is x = 240, y = 25
Because when the train passes through the tunnel and bridge, the calculation of the passing time starts from the locomotive entering the tunnel head and ends at the end of the train leaving. That is to say, the distance of the train passing through a tunnel plus its own length

It took 60 seconds for a train to cross a 1260 meter long bridge and 90 seconds to cross a 2010 meter long tunnel. What's the speed and length of the train?

Let the length of the train be x meters, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (1260 + x) △ 60 = (2010 + x) △ 90, and take 180 on both sides to get: (1260 + x) × 3 = (2010 + x) × 2, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

It takes three minutes for the train to pass a 2700 meter long bridge from the front of the train to the rear of the train. It is known that the speed of the train is 1000 meters per minute. How long is the body of the train?

1000 × 3-2700, = 3000-2700, = 300 (m); answer: the length of the train body is 300 m

It takes three minutes for the train to pass a 2700 meter long bridge from the front of the train to the rear of the train. It is known that the speed of the train is 1000 meters per minute. How long is the body of the train?

1000 × 3-2700, = 3000-2700, = 300 (m); answer: the length of the train body is 300 m

A 280 meter long train passes a 1000 meter long bridge. When the train just gets on the bridge, there is a person standing at the end of the train. It takes 64 seconds from the time when the train gets on the bridge to the time when the person leaves the bridge. What is the speed of the train

(1000 + 280) / 64 = 20m / S

The bridge is 1200 meters long and the train is 280 meters long. The train runs on the bridge at a speed of 20 meters per second. How long does it take for the train to get on and off the bridge?

(1200 + 280) / 20 = 74 (seconds)

A bridge is 1200 meters long and a train is 300 meters long. The train is running at a speed of 25 meters per second. How long does it take for the train to get on and off the bridge

(1200 + 300) / 25 = 60 seconds

It takes 80 seconds for a train to pass the 200 meter bridge, and 72 seconds for a train to pass the 114 meter long bridge
It's a process

Let the length be x meters
Then when it's 200 meters, it's a total of X + 200 meters
Speed (x + 200) / 80
Last speed (x + 114) / 72
So (x + 200) / 80 = (x + 114) / 72
So 72 (x + 200) = 80 (x + 114)
Divide both sides by 8
9x+1800=10x+1140
x=660
A: the train is 660 meters long

A train is 200 meters long. It takes 60 seconds to cross the bridge. It takes 40 seconds to get the length of the bridge and the speed of the train

The bridge is x meters long
(X-200)/40=(X+200)/60
X=1000
(1000-200) / 40 = 20 (M / s)
A: the bridge is 1000 meters long and the train speed is 20 meters per second
The distance is in direct proportion to the time

It took three minutes for a 200 meter long train to cross a bridge at a speed of 800 meters per minute, which is a long bridge______ Rice

800 × 3-200 = 2400-200 = 2200 (m) a: the length of the bridge is 2200 M