A passenger car and a truck travel towards each other from A and B at the same time. The bus travels 60 kilometers per hour, and the truck travels 80 kilometers per hour. The vehicles meet at a distance of 30 kilometers from the planting point. Find the distance between A and B in kilometers?
客车和货车同时从A、B两地相向而行，客车每小时行60千米，货车每小时行80千米，辆车在距离种点30千米处相遇．求A、B两地相距多少千米？
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">30 * (1/10) * 140</gadget>
<output>420</output>

<result>420</result>