Two trains depart from two stations at the same time. Car A travels 48 kilometers per hour, and train B travels 78 kilometers per hour. After 2.5 hours, the two trains meet. How long is the railway between the two stations?
两列火车从两个车站同时相向出发，甲车每小时行48千米，乙车每小时行78千米，经过2.5小时两车相遇．两个车站之间的铁路长多少千米？
<gadget id="calculator">48 + 78</gadget>
<output>126</output>

<gadget id="calculator">126 * 2.5</gadget>
<output>315</output>

<result>315</result>