A train of trucks and a train of passenger trains leave oppositely from cities A and B at the same time. It is known that the passenger train travels 55 kilometers per hour, and the ratio of the speed of the passenger train to the speed of the truck is 11:9. What is the distance in kilometers?
一列货车和一列客车同时从甲乙两个城市相对开出，已知客车每小时行55千米，客车速度与货车的速度的比是11：9，两车开出后8小时相遇，甲乙两城市间的距离是多少千米？
<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">55 * (9/11)</gadget>
<output>45</output>

<gadget id="calculator">55 + 45</gadget>
<output>100</output>

<gadget id="calculator">100 * 5</gadget>
<output>500</output>

<result>500</result>