Question

小学六年级奥数！急！

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？

Answer 1

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

Answer 2

设x

Answer 3

货车行驶时间为：14个小时 3*4+2

s=18*50+42*14=1488千米

Answer 4

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。

Answer 5

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

Answer 6

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