一列客车和一列货车同时从两地相向开出,经过18小时两车在某处相遇,已知道客车每时行50千米,货车每时比客车少行8千米,货车每行驶3小时要停驶1小时,问:两地之间的铁路长多少千米?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 08:50:54
![一列客车和一列货车同时从两地相向开出,经过18小时两车在某处相遇,已知道客车每时行50千米,货车每时比客车少行8千米,货车每行驶3小时要停驶1小时,问:两地之间的铁路长多少千米?](/uploads/image/z/437751-63-1.jpg?t=%E4%B8%80%E5%88%97%E5%AE%A2%E8%BD%A6%E5%92%8C%E4%B8%80%E5%88%97%E8%B4%A7%E8%BD%A6%E5%90%8C%E6%97%B6%E4%BB%8E%E4%B8%A4%E5%9C%B0%E7%9B%B8%E5%90%91%E5%BC%80%E5%87%BA%2C%E7%BB%8F%E8%BF%8718%E5%B0%8F%E6%97%B6%E4%B8%A4%E8%BD%A6%E5%9C%A8%E6%9F%90%E5%A4%84%E7%9B%B8%E9%81%87%2C%E5%B7%B2%E7%9F%A5%E9%81%93%E5%AE%A2%E8%BD%A6%E6%AF%8F%E6%97%B6%E8%A1%8C50%E5%8D%83%E7%B1%B3%2C%E8%B4%A7%E8%BD%A6%E6%AF%8F%E6%97%B6%E6%AF%94%E5%AE%A2%E8%BD%A6%E5%B0%91%E8%A1%8C8%E5%8D%83%E7%B1%B3%2C%E8%B4%A7%E8%BD%A6%E6%AF%8F%E8%A1%8C%E9%A9%B63%E5%B0%8F%E6%97%B6%E8%A6%81%E5%81%9C%E9%A9%B61%E5%B0%8F%E6%97%B6%2C%E9%97%AE%EF%BC%9A%E4%B8%A4%E5%9C%B0%E4%B9%8B%E9%97%B4%E7%9A%84%E9%93%81%E8%B7%AF%E9%95%BF%E5%A4%9A%E5%B0%91%E5%8D%83%E7%B1%B3%3F)
一列客车和一列货车同时从两地相向开出,经过18小时两车在某处相遇,已知道客车每时行50千米,货车每时比客车少行8千米,货车每行驶3小时要停驶1小时,问:两地之间的铁路长多少千米?
一列客车和一列货车同时从两地相向开出,经过18小时两车在某处相遇,已知道客车每时行50千米,货车每时比客车少行8千米,货车每行驶3小时要停驶1小时,问:两地之间的铁路长多少千米?
一列客车和一列货车同时从两地相向开出,经过18小时两车在某处相遇,已知道客车每时行50千米,货车每时比客车少行8千米,货车每行驶3小时要停驶1小时,问:两地之间的铁路长多少千米?
货车速度为50-8=42 千米/小时
货车每4小时行驶 42*3=126 千米
18小时中货车休息了4小时
客车经过18*50=900千米
货车经过 (18-4)*42=588千米
两地相距=900+588=1488千米
货车行驶时间为:14个小时 3*4+2
s=18*50+42*14=1488千米
设x
行驶18小时,客车走了18*50=900,货车每行驶3小时要停驶1小时,也就是货车每4小时只行驶3小时,18除以4等于4余2,那么货车在这18小时内行驶的路程为:42*3*4+42*2=588,那么两地之间的铁路长为:900+588=1488千米。方法就是这样,可能计算结果有误。
货车每小时车速:50-8=42千米/时
火车四小时的平均车速42*3/4=31.5千米/时
所以,每小时两车和速度31.5+50=81.5千米/时
前十六小时路程81.5*16=13040千米
后两个小时路程(42+50)*2=184千米
总路程184+13040=13224千米
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