AMC8 2005

AMC8 2005 · Q10

AMC8 2005 · Q10. It mainly tests Linear equations, Rates (speed).

Joe had walked half way from home to school when he realized he was late. He ran the rest of the way to school. He ran 3 times as fast as he walked. Joe took 6 minutes to walk half way to school. How many minutes did it take Joe to get from home to school?

乔走完回家到学校的半途时意识到自己迟到了。他跑完了剩下的路程。他的跑速是他走速的 3 倍。乔走半途到学校用了 6 分钟。乔从家到学校总共用了多少分钟？

(A) 7 7

(B) 7.3 7.3

(D) 8 8

(E) 8.3 8.3

Answer

Correct choice: (D)

正确答案：（D）

Solution

(D) Covering the same distance three times as fast takes one-third the time. So Joe ran for 2 minutes. His total time was 6 + 2 = 8 minutes.

（D）以三倍速度跑完相同距离所用时间是原来的三分之一。因此，Joe 跑了 2 分钟。他的总时间是 6 + 2 = 8 分钟。

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