A passenger car and a truck depart from A and B in opposite directions at the same time. The bus travels 60 kilometers per hour and the truck travels 80 kilometers per hour. The two cars meet at a distance of 30 meters from the midpoint. What is the distance between A and B in miles?
客车和货车同时从A、B两地相向开出，客车每小时行60千米，货车每小时行80千米．两车在距中点30米处相遇．A、B两地相距多少千米．
<gadget id="calculator">60 + 80</gadget>
<output>140</output>

<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">30 * (1/10)</gadget>
<output>3</output>

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

<result>420</result>