数学题：客车从甲地到乙地要6小时；货车从乙地到甲地要8小时。两车同时分别从两地出发相对开出，相遇时货车行了240km。甲乙俩地相距多少千米？

数学题解答：在路程一定的情况下，两车的速度比与时间比相反。

所以两车速度比是：客：货＝8:6=4:3

两车相遇时所行路程比也是4:3

所以，客车行了：240÷3×4=320（千米）

两地距离：240+320=560（千米）

推荐阅读：
Ed-Tech Start-Ups Can Allow Anyone To Become A Teacher　 Russian Hacker Sold Millions Of Passwords For Less Than A $1, Sh　 How To Successfully Fine-tune Your Overall Social Media Strategy　 What It Really Takes To Make Money As a Blogger　 How Do You Increase Website Domain Authority?　 Bitcoin Expert Regrets Blogging About Rumored Bitcoin Creator　 WordPress Theme Seller, Templatic, Warns Users Of Hacking　 Samsung Utilizes Virtual Reality Stories For Children’s Bedtimes　 6 Things You Need to Do Before Writing a Single Word on Your Blo　 Verge Introduces Innovative Gadget Blog, ‘Circuit Breaker’