It's about a 25-minute walk.这句话对吗?怎么我们老师给我改作文改的是It's about a 25-minutes walk?

问题描述:

It's about a 25-minute walk.
这句话对吗?
怎么我们老师给我改作文改的是It's about a 25-minutes walk?

是对的,老师改错了.
有连字符的话不加s.