phy-motion
2012-02-27 5:49 am
圖片參考：http://img408.imageshack.us/img408/2352/52508494.jpg
-----------------------------------------------------------------------------------------------------------------
回答 (1)
2012-02-27 5:59 am
✔ 最佳答案
Let t be the time needed for Tom to overtake John.Distance travelled by John = 1.2t
Distance travelled by Tom = 1.5t
Hence, 1.5t = 1.2t + 3
i.e. 0.3t = 3
t = 3/0.3 s = 10 s
收錄日期: 2021-04-11 18:53:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120226000051KK01018