A freight train and a passenger train depart from opposite places at the same time. The truck travels 48 kilometers per hour, the bus travels 52 kilometers per hour, and they meet after 2.5 hours. How many miles is the railway between the two places?
一列货车和一列客车同时从两地相对开出．货车每小时行48千米，客车每小时行52千米，2.5小时后相遇．两地间的铁路长多少千米？
<gadget id="calculator">48 + 52</gadget>
<output>100</output>

<gadget id="calculator">100 * 2.5</gadget>
<output>250</output>

<result>250</result>