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火車過橋橋長怎麼求
火車過橋橋長怎麼求
更新时间:2026-09-09 01:07:11

一列火車以每秒20米的速度通過一座大橋,從火車上橋到完全通過用了1分鐘的時間,火車完全在橋上的時間是40秒,大橋長多少米?

火車過橋橋長怎麼求(較難的火車過橋問題)1

火車過橋橋長怎麼求(較難的火車過橋問題)2

1分鐘=60秒

20×60=1200(米)

20×40=800(米)

(1200-800)÷2=200(米)

1200-200=1000(米)

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