A passenger car and a truck leave opposite directions from A and B at the same time. The bus travels 60 kilometers per hour, and the truck travels 80 kilometers per hour. The two vehicles meet at a distance of 15 kilometers from the midpoint. Find the distance between A and B in kilometers?
客车和货车同时从A、B两地相向开出，客车每小时行驶60千米，货车每小时行驶80千米，两车在距中点15千米处相遇．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">60 + 80</gadget>
<output>140</output>

<gadget id="calculator">15 * (1/10) * 140</gadget>
<output>210</output>

<result>210</result>