狐狸在岸上跑的速度是鸭子速度的4倍.not 4.6倍

The oringinal question:

鸭子落到圆形湖中，狐狸在岸边想吃鸭子。鸭子受伤，无法从水里起飞，必须游到岸边才能起飞。狐狸在岸上跑的速度是鸭子速度的4倍，问鸭子是否可以游到岸边起飞跑掉？how?
I think,nobody can understand your method ,even smart brother.Anyway,thank you.

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