Two cars, A and B, depart from cities A and B at the same time. Car A travels from city A to city B, traveling 10% of the journey per hour. Car B travels from city B to city A, traveling 80,000 per hour. When car A is 260 kilometers away from city A, car B is 320 kilometers away from city B. How many kilometers is the distance between cities A and B?
甲、乙两车分别同时从A、B两城相对开出，甲车从A城开往B城，每小时行全程的10%，乙车从B城开往A城，每小时行80千米，当甲车距A城260千米时，乙车距B城320千米，A、B两城之间的路程有多少千米？
<gadget id="calculator">320 / 80</gadget>
<output>4</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4 * (1/10)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">260 / (2/5)</gadget>
<output>650</output>

<result>650</result>