An express train and a slow train depart from two cities A and B at the same time. The express train travels 120 kilometers per hour, and the slow train travels 95 kilometers per hour. After 2.5 hours, the two trains meet. How many kilometers are there between cities A and B?
一列快车和一列慢车从甲、乙两个城市同时相对开出，快车每小时行120千米，慢车每小时行95千米，经过2.5小时两车相遇．甲、乙两城市相距多少千米？
<gadget id="calculator">120 + 95</gadget>
<output>215</output>

<gadget id="calculator">215 * 2.5</gadget>
<output>537.5</output>

<result>537.5</result>