最近的【某地】离我们学校步行大约20分钟：
The nearest (someplace) is about 20 minutes' walk from our school.
你这个说的思维有点乱
it takes us around 20 mimutes walks to the nearest school
It takes us less than 20 mimutes walk to our school.
It takes 20-minute-walk to go the nearst school.
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