Teacher Zhang and Qingqing walked towards each other from A and B at the same time. Teacher Zhang walked 60 meters per minute, and Qingqing walked 40 meters per minute. The two met at a place 80 meters away from the midpoint. minute?
张老师和青青同时从A，B两地相对而行，张老师每分钟走60米，青青每分钟走40米，两人在距中点80米的地方相遇，他们从出发到相遇共用了几分钟？
<gadget id="calculator">60 - 40</gadget>
<output>20</output>

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

<gadget id="calculator">80 * (1/10)</gadget>
<output>8</output>

<result>8</result>