The length of the railway between station A and station B is 250 kilometers. A train of freight trains and a train of passenger trains depart from these two stations at the same time. The passenger train travels 52 kilometers per hour, and the freight train travels 48 kilometers per hour. After how many hours do the two trains meet?
甲乙两站的铁路长250千米，一列货车和一列客车同时从这两站相对开出，客车每小时行52千米，货车每小时行48千米，经过几小时两车相遇？
<gadget id="calculator">52 + 48</gadget>
<output>100</output>

<gadget id="calculator">250 / 100</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>