今天做题，遇到两个题不太理解，希望各位高手帮助解答！多谢！ 1. What was John's average driving speed in miles per hour during a 15-minute interval? (1)He drove 10 miles during the interval. (2)His maximum speed was 50 miles per hour and his minimum speed was 35 miles per hour during this interval. 答案是E，不太理解。
2.On a certain day it took Bill three times as long to drive from home to work as it took Sue to drive from home to work. How many kilometers did Bill drive from home to work? (1)Sue drove 10 kilometers from home to work, and the ratio of distance driven from home to work time to drive from home to work was the same for Bill and Sue that day. (2)The ratio of distance driven from home to work time to drive from home to work for Sue that day was 64 kilometers per hour. 答案是A。
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发表于 2010-6-7 12:50:13
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