Two cars A and B are traveling towards each other from places A and B at the same time. A travels 60 kilometers per hour, and B travels 80 kilometers per hour. After 3 hours, the two cars meet. How many kilometers are there between A and B?
甲、乙两辆汽车同时从A、B两地相向而行．甲每小时行60千米，乙每小时行80千米，3小时后两车相遇，A、B两地相距多少千米？
<gadget id="calculator">60 + 80</gadget>
<output>140</output>

<gadget id="calculator">140 * 3</gadget>
<output>420</output>

<result>420</result>