The distance between A and B is 270 kilometers. Two cars A and B drive from A and B at the same time. Car A travels 42 kilometers per hour, and car B travels 48 kilometers per hour. How many hours later will the two cars meet?
甲乙两地相距270千米，A、B两辆车同时从甲、乙两地相对开出，甲车每小时行42千米，乙车每小时行48千米，几小时后两车相遇？
<gadget id="calculator">42 + 48</gadget>
<output>90</output>

<gadget id="calculator">270 / 90</gadget>
<output>3</output>

<result>3</result>