Two people, A and B, set off from A and B at the same time, and walk towards each other. When A walks half of the distance, B is 120 kilometers away from A; when B walks halfway, A is still 75 kilometers away from B. , what is the distance between A and B in kilometers?
甲乙二人分别从A、B两地同时出发，相向而行，当甲走了一半路程时，乙距A地120千米；当乙走到一半路程时，甲距B地还有75千米，那么A、B两地的距离为多少千米．
<result>200</result>