Two people, A and B, set off from A and B at the same time and walk toward each other. B's speed is 2/3 of A's. After they meet, they continue to move forward. A arrives at B, and B returns immediately after arriving at A. It is known The place where the two met for the second time is 3000 meters away from the place where they first met. Find the distance between A and B.
甲、乙两人分别从A、B两地同时出发，相向而行，乙的速度是甲的2/3，两人相遇后继续前进，甲到达B地，乙到达A地立即返回，已知两人第二次相遇的地点距离第一次相遇的地点是3000米，求A、B两地的距离．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 * (3/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 * (2/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(6/5) - (4/5)</gadget>
<output>2/5 = around 0.4</output>

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

<result>7_500</result>