A and B start from a point P on a circular runway with a circumference of 250 meters at the same time and in the same direction and jog along the runway at a constant speed. A runs 3 (2/3) meters per second, and B runs 3 (1/6) meters per second. So how many minutes did it take from the departure to the first encounter between the two at point P?
甲、乙两人从周长为250米的环形跑道上一点P同时、同向出发沿着跑道匀速慢跑．甲每秒跑3(2/3)米，乙每秒跑3(1/6)米．那么从出发到两人第一次在点P相遇所用去的时间是多少分钟．
<result>25</result>