Two trains of freight cars, A and B, are running towards each other from A and B to deliver goods at the same time. A train travels 54 kilometers per hour, and B trains travel 36 kilometers per hour. The two trains continue to travel between A and B cities. When the two cars met for the ninth time, car B traveled another 180 kilometers and met car A. What is the distance in kilometers between places A and B?
甲、乙两列货车同时从A、B两城相向而行运送货物，甲车每小时行54千米，乙车每小时行36千米，两车不断往返于A、B两城之间．当两车第九次相遇以后，乙车又行了180千米与甲车相遇，A、B两地间的距离是多少千米？
<gadget id="calculator">54 + 36</gadget>
<output>90</output>

<gadget id="calculator">180 / 36</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">90 * (5/2)</gadget>
<output>225</output>

<result>225</result>