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A 450m long train passes a 1050m long bridge in minutes and seconds, and then passes a tunnel in 40 seconds at the same speed. How long is the tunnel
What are your minutes and seconds? Add: 450 + 1050 = x * 80 find out the speed x = how much, then tunnel length y + 450 = 40 * x find out y = 300 meters
It takes 20 seconds for a train to travel at a constant speed through a 450m long tunnel. There is a lamp on the top of the tunnel, which lights down vertically. The time that the lamp shines on the train is 5S. According to the above data, we can find: (1) the length of the train; (2) the time that the train runs completely in the tunnel
(1) Let the length of the train be x m, the equation is 450 + X20 = X5, and the solution is x = 150; (2) 450 + 15020 = 30 (M / s), (450-150) △ 30 = 10 (s), so the length of the train is 150 m; the time of the train body completely in the tunnel is 10 seconds
It takes 20 seconds for a train to pass through a 450 m tunnel. There is a lamp on the tunnel, which shines down vertically. The time of shining on the train is 5 seconds
1 find the length of the train 2 find the time of the train running completely in the tunnel
The second question, remember is the time to drive completely in the tunnel
* * * * * * * *
The length of the train is 150m
It takes 10 seconds to drive completely in the tunnel
Let the car length be x and the speed be YM / s
（x+450）/y=20
The solution is x = 150, y = 30
The length of the train traveling in the cave needs to be subtracted from its own length, so
（450-150）/30=10
RELATED INFORMATIONS
- 1. It takes 20 seconds for a train to run at a constant speed through a 450m long tunnel. There is a light on the tunnel, and the time for the light to shine on the train is 5S Ask: (1) the length of the train; (2) the time that the train runs completely in the tunnel There is a light in the tunnel. The time that the light shines on the train is 5S. What do you mean///////
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