AMC 8 2014 Problem 17
AMC8 2014 年第 17 题
行程问题★★★☆☆
George walks 1 mile to school. He leaves home at the same time each day, walks at a steady speed of 3 miles per hour, and arrives just as school begins. Today he was distracted by the pleasant weather and walked the first $1/2$ mile at a speed of only 2 miles per hour. At how many miles per hour must George run the last $1/2$ mile in order to arrive just as school begins today?
每天同一时间以恒定的 3 英里每小时的速度从家步行 1 英里去学校，且恰好准时到校。今天他被好天气吸引，因此前英里路程的速度仅为 2 英里每小时。那么后面英里的路程他应该以多少英里每小时的速度奔跑才能准时到校？
- A.4
- B.6
- C.8
- D.10
- E.12
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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