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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
数学题！尽快给我答案！谢谢！
Jul 31st 2013, 08:04

這個是常見的題型。

你設 x 為游速，y 為水速，d 為距離，那現在題目問 d/y。

(x-y)*12 = d
(x+y)*4 = d

留意 x = d/12 + y = d/4 - y

那麼 (d/4 - d/12) = 2y

d/6 = 2y

d/y = 2*6 = 12 （分鐘）

參考資料 Calculated

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