Two cars, A and B, start from A and B at the same time and drive toward each other. The speed of B is 2/3 of that of A. When they meet for the first time, B continues to A and arrives at A. Return immediately after landing, and continue to move forward to B, and return immediately after arriving at B. When the second meeting occurs, the distance between the second meeting point and the first meeting point is 3000 kilometers. Find the distance between AB and AB. How many kilometers?
甲乙两辆汽车分别从A、B两地同时出发，相向而行，乙车的速度是甲车的(2/3)，当它们第一次相遇后，乙车继续向A地前进，到达A地后立即返回，甲车继续向B地前进，到达B后立即返回，到第二次相遇时，第二次的相遇点与第一次相遇点相距3000千米，求AB两地的距离是多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3_000 / (2/5)</gadget>
<output>7_500</output>

<result>7_500</result>