Two trains leave opposite to each other from two stations, train A travels 48 kilometers per hour, train B travels 54 kilometers per hour, and they meet after 4.5 hours. How long is the railway between the two stations?
两列火车从两个车站相对开出，甲车每小时行48千米，乙车每小时行54千米，经过4.5小时相遇．两车站之间的铁路长多少千米？
<gadget id="calculator">48 + 54</gadget>
<output>102</output>

<gadget id="calculator">102 * 4.5</gadget>
<output>459</output>

<result>459</result>