Cars A and B drive oppositely from two places at the same time and travel along the same road at speeds of 80 kilometers per hour and 60 kilometers per hour respectively. They meet somewhere 30 kilometers away from the midpoint of the two places. What is the distance between the two places? km.
甲乙两车同时从两地相对开出，沿同一条公路行进，速度分别为每小时80千米和每小时60千米，在距两地中点30千米的某处相遇，两地相距多少千米．
<result>520</result>