The length of the railway between A and B is 480 km. Two trains depart from A and B at the same time. The express train travels 140 km per hour, and the slow train travels 100 km per hour. How many hours later will the two trains meet?
甲、乙两地铁路长480km，两列火车同时从甲、乙两地相对开出，快车每小时行驶140km，慢车每小时行驶100km，这两列火车几小时后相遇？
<gadget id="calculator">140 + 100</gadget>
<output>240</output>

<gadget id="calculator">480 / 240</gadget>
<output>2</output>

<result>2</result>