Xiao Jiang went to play with his parents and got on a train running at a constant speed. It took 18 seconds from entering the 320m tunnel to completely passing through the tunnel. There is one at the

Xiao Jiang went to play with his parents and got on a train running at a constant speed. It took 18 seconds from entering the 320m tunnel to completely passing through the tunnel. There is one at the top of the tunnel. Think of it this way: this lamp can be placed anywhere at the top of the tunnel. If the speed is x m/s, the car body length is 10 times x, and the distance from the first entrance to the last full tunnel is the length of the whole tunnel plus the car body length of a train, that is, (10x+320) m, so the equation10x+320 =/kloc-can be listed. Classmate, do you understand? I'll give it to you when I understand it ~