数学题：AB两地的路程是550千米，甲乙两车从两地同时相对而行，行了4小时没相遇，还剩20％。已知甲车每小时行60千米，求乙车每小时行多少千米？

数学题解答：设乙车每小时行x千米。

60×4＋4x＝550×（1-20%）

240+4x=440

4x=200

x=50

答：乙车每小时行50千米。

推荐阅读：
Critics of Japan’s Handling of the Cruise Ship Coronavirus Quara　 Tips for Starting a Car-Themed Blog　 How to Build a Popular, Trustworthy Blog　 6 Simple Ways to Promote Your Blog　 The Secret to Writing More Compelling Blog Titles　 5 Habits Of Highly Successful Bloggers　 5 Ways to Connect Your Blog Content Writers　 Google’s Perfect World: A New Technical SEO Framework　 Boost the Visibility of Your Blog With In-Person Events　 Are Top 20 Witnesses Voting Each Other? Introducing Witness-voti