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：
Linden Labs Looks To Create ‘WordPress For Social VR’　 3 Stories Of Bloggers Whose Lives Were Put At Risk Because Of Th　 Controversial Blogger Amos Yee Detained In The United States　 4 Handy Resources to Make Tax Season Simpler　 4 Mistakes Newbie Travel Bloggers Make　 The Best Ways to Avoid Distractions whilst Blogging　 7 Content Marketing Tips for First-Time Bloggers　 How to Check if Array/List Contains Duplicate Numbers or Strings　 Counting the Stepping Numbers between A Range using Depth/Breadt　 Intersection of Three Sorted Arrays using Three Pointers