Two trains depart from the two cities at the same time and meet each other in 6.5 hours. When they meet, car A travels 52 kilometers longer than car B, and car B's speed is (2/3) that of car A. Find the distance between the two cities.
两列火车同时从两个城市相对开出，6.5小时相遇．相遇时甲车比乙车多行52千米，乙车的速度是甲车的(2/3)．求两城之间的距离．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

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

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">52 / (1/5)</gadget>
<output>260</output>

<result>260</result>