数学题:某县城去省城的高速公路长160千米
- 时间:2020-05-07 11:42:14
- 分类:数学世界
- 阅读:166 次
数学题:某县城去省城的高速公路长160千米,普通公路长200千米。一辆汽车走高速公路的速度是80千米/小时,走普通公路的速度是40千米/小时。从县城去省城,走高速公路比普通公路节省多少时间?
数学题解答:
分别算出走高速公路和普通公路所用的时间,再相减。要注意不要弄错路程。
走高速用的时间:160÷80=2(小时)
走普通公路用的时间:200÷40=5(小时)
走高速公路比普通公路节省的时间:5-2=3(小时)
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