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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...
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?
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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
2010-10-30
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货车行驶时间为:14个小时 3*4+2
s=18*50+42*14=1488千米
s=18*50+42*14=1488千米
参考资料: =
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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。
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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
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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