张老师和李老师同时从学校出发，步行15千米去县城购买书籍，张老师比李老师每小时多走1千米，结果比李老师早到半小时，两位老师每小时各走多少千米？设李老师每小时走x千米，依题意，得到的方程是（     ）

    Good evening, everyone! Today, I'm very glad1a speech2name is "My Dream". We know everyone has his or her own dream. Some people want to be basketball players because they are good3sports. Some would like to become4 because they like to stay with children. Do you know5I'm going to be when I grow up? I like cooking,6 I want to become a good cook. I think I must have great7 cooking food. I'd like to ask everyone to taste my food. I also like seeing their smiling faces after8the delicious food. However, it's not so9to be a good cook. I decided to learn 10things about cooking from now on. I will work hard for my dream. I'm sure I will succeed (成功) one day.