萝岗甜橙，兼有橙、橘、柑的外形，果实汁液丰盈、清甜，具桂花香味，耐贮藏，曾被评选为广州市名优产品．请回答：

十把钥匙开十把锁，你不知哪把钥匙开哪把锁，最多要试____次可把钥匙与锁配对。

    Joe Read studied in this school for four years. When he finished school, he was already eighteen years old. And then his father said to him, “You finished school, and you are a good student. Now you may go to town and get a good job. They need some clever people to work in the office. The people there can get a lot of money now. If you stay at home, you can't get money from our family.” A few weeks later, Joe went to the office and asked for a job there. A man took him into a small room and gave him some questions on a piece of paper. Joe answered the questions quickly, and he gave the paper to the man. The man looked at the paper for a few minutes and then asked, “You were born on Sep. 23. But which year were you born in?” Joe answered, “Oh, every year.”

一辆汽车在高速公路上行驶，由于遇到紧急情况而刹车，以速度$v\left(t\right)=7-3t+\frac{25}{1+t}$ （t的单位：s，v的单位：m/s）行驶至停止。在此期间汽车继续行驶的距离（单位：m）是（   ）