下列重要的地理分界线中，属人口分界线的是

10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（ ），并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Today while walking past the train station, I notice two young men carrying some huge bag. They were consulting a map and seemed confused, so I asked them who they were looking for. They were looking for an address that wasn't easy to find it, and it happened to being the same way l was going.  However, I helped them with one of the bags and walked with them until we found the rightly house. We had nice talk and l was told that they had come all the way from French. They were very grateful for me, and I felt very happy.

用一只平底锅煎饼，每次只能放两只，煎一只要2分钟（规定正、反面各需1分钟），问煎5只饼至少需要几分钟？