摘要
【英文原题】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？【中文意译】乔治走1英里去上学。他每天在相同的时间离开家,以每小时3英里的匀速行走。
