train of passenger trains and a train of freight trains leave oppositely from two cities A and B at the same time. It is known that the passenger train travels 55 kilometers per hour, and the speed ratio of the passenger train and the freight train is 11:9. How many kilometers is the railway?
一列客车和一列货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，客车与货车速度的比是11：9，两车开出后5小时相遇，甲乙两个城市间的铁路长多少千米？
<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>