三角形ABC三边长都是100米,甲自A向C,乙自B向A,如图,同时开始沿三角形兜圈子.甲每分钟走......

问题描述：

三角形ABC三边长都是100米,甲自A向C,乙自B向A,如图,同时开始沿三角形兜圈子.甲每分钟走120米，乙每分钟走150米，但过每个顶点时因转弯的缘故，总要花费5秒的时间．问乙追及甲，是在出发后多少时间？位置在何处？
`````A甲
`````/\ ↓
````/``\
↑ /````\
乙ˉˉˉˉC
B

帮帮忙~~~~~~
`````A甲
`````````````````````/\ ↓
````````````````````/``\
````````````````↑ /`````\
```````````````乙ˉˉˉC
`````````````````B

问题解答：

不懂