Maths question

2008-04-24 2:04 am
叮叮和噹噹從甲地跑到相距144米的乙地。噹噹出發時,叮叮已跑了17米;在噹噹到達乙地後,叮叮還有7米才到達乙地。問噹噹在距離乙地多少米追上叮叮?
更新1:

請寫出解題過程﹗﹗﹗﹗﹗﹗Please!!!!!!!!!!!!!!!!!!!!!!!!

更新2:

?

回答 (1)

2008-04-24 2:32 am
✔ 最佳答案
設該距離為 L, 叮叮的速度為u,噹噹的速度為v

L/v = (L-7)/u -----(1)
144/v = (144-7-17)/u -----(2) (Get these equations by considering the time)

So, (1)/(2): L/144 = (L-7)/120
L = 42 m

所以噹噹在距乙地42米時追過叮叮


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