It takes fifteen minutes to walk there.
问题描述：
It takes fifteen minutes to walk there.
改为同义句
It's a （ ）（ ） to get there.
今天啊···
答
It's a （fifteen-minute ）（ walk ） to get there.
说明要填 名词
所以可以联想定语的用法an 8-year-old boy
把fifteen minutes变化下形式,表示十五分钟的路程（walk从动词变名词）