狐狸在岸上跑的速度是鴨子速度的4倍.not 4.6倍

來源: 於 2010-05-14 07:34:09 [舊帖] [給我悄悄話] 本文已被閱讀：次

The oringinal question:

鴨子落到圓形湖中，狐狸在岸邊想吃鴨子。鴨子受傷，無法從水裏起飛，必須遊到岸邊才能起飛。狐狸在岸上跑的速度是鴨子速度的4倍，問鴨子是否可以遊到岸邊起飛跑掉？how?
I think,nobody can understand your method ,even smart brother.Anyway,thank you.