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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