一道行程问题
- 时间:2020-04-06 17:58:42
- 分类:数学世界
- 阅读:152 次
小华从家到学校,步行需要28分钟,骑自行车需要8分钟。一天他骑车去学校,行了3分钟后,即改为步行。问比全程骑车迟到几分钟?
分析:算出所花的总时间后,再与全程骑车的时间相比较,就不难得出答案了。
骑车3分钟行了全程的几分之几?
1/8×3=3/8
还剩全程的几分之几(即步行的路程占全程的几分之几)
1-3/8=5/8
还需行多少分钟才能到学校?
5/8÷(1/28)=17.5(分)
一共花了多少时间?
3+17.5=20.5(分)
比全程骑车多用多少时间?
20.5-8=12.5(分)
至此题目得解。
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