It takes five hours to get to his school.

请往这边看：
句型： It takes (sb) to do sth. 这里 sb 不是必须的,可有,可无.你们老师在讲这个句型是应该像我写的那样,把 sb 用括号括起来,这样学生就很清楚了.

在教个你一个技巧：只要是划线提问,不要给原句加字,也就是说,原句中没有的词,就不要用.
例如：

It takes five hours to get to his school. 划线==five hours.
How long does it take to get to his school? 如果你加了him,就等于改了原题.