Two passenger cars, A and B, depart from cities A and B in opposite directions. Car A travels 65 kilometers per hour, and car B travels 70 kilometers per hour. After 2.5 hours, the two buses meet. Find the distance between cities A and B. ．
甲、乙两辆客车从A、B两城相向开出，甲车每小时行65千米，乙车每小时行70千米，2.5小时后两车相遇，求A、B两城相距多远．
<gadget id="calculator">65 + 70</gadget>
<output>135</output>

<gadget id="calculator">135 * 2.5</gadget>
<output>337.5</output>

<result>337.5</result>