Car A and car B drive oppositely from two places at the same time. Car A travels 55 kilometers per hour, and car B travels 65 kilometers per hour. After 3.5 hours, how many kilometers are the distance between the two places?
甲、乙两车同时从两地相对开出，甲车每小时行55千米，乙车每小时行65千米，经过3.5小时相遇，两地相距多少千米？
<gadget id="calculator">55 + 65</gadget>
<output>120</output>

<gadget id="calculator">120 * 3.5</gadget>
<output>420</output>

<result>420</result>