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假設火車長度為L,速度為V1、根據經過路標時間可以算出火車長度為:L=5V2、根據經過300米橋時,時間從車頭進入到車尾出來,行駛距離實際為300+L米,用時20秒,可以得出:300+L=20V根據以上組合,得出V=20米/秒,L=100米3、…
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