这艘轮船最多驶出多远就应返回

  • 时间:2020-05-20 15:29:31
  • 分类:数学世界
  • 阅读:162 次

一艘轮船所带的燃料最多可用12小时,驶出时顺水,每时行驶30千米,返回时逆水,每时行的路程是顺水的4/5。这艘轮船最多驶出多远就应返回?(用多种方法解答)

数学题解答:先用方程解:设行出x小时后就应返回。

数量关系:行出的路程=返回的路程

方程:30x=(12-x)×24

解得:x=5又1/3

5又1/3 × 30 = 160(千米)

答:这艘轮船最多驶出160千米就应返回。

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