Joining with Friend

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2769 [PDF](https://uva.onlinejudge.org/external/117/p11722.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11722/ca9f04cf54605dd5de135fdfc34cacfe5de71169.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11722/d2dabf81784f1e8ae2e1a0c3ba27e0c1dfc8129d.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11722/f3a4f7c487f9edeb98bb9c534f2de161b274194a.png)

输入输出样例

输入样例 #1

2
1000 1040 1000 1040 20
720 750 730 760 16

输出样例 #1

Case #1: 0.75000000
Case #2: 0.67111111