The distance between the two places is 540 kilometers, and two trains, A and B, leave opposite to each other at the same time. Car A travels 96 kilometers per hour, and car B travels 84 kilometers per hour. After how many hours do the two cars meet?
两地相距540千米，甲乙两列火车同时从两地相对开出．甲车每小时行96千米，乙车每小时行84千米，经过几小时两车相遇？
<gadget id="calculator">96 + 84</gadget>
<output>180</output>

<gadget id="calculator">540 / 180</gadget>
<output>3</output>

<result>3</result>