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答案為50.5秒 通過橋比通過路標相當於多走了300米多走了23秒-6.5秒=16.5秒車速為300/16.5米/秒 通過山洞比通過路標相當於多走了800米應當多走800*16.5/300=44秒共走44+6.5=50.5秒
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