The school organizes a visit to a museum that is 3 kilometers away. Xiaoli and other students walk there at an average speed of 60 m/min. Can Xiaoming and other classmates catch up with Xiaoli and the others in a few minutes after they set off?
学校组织到相距3千米的博物馆参观，小丽等同学以60米/分钟的平均速度步行前往，小明等同学在教室内进行大扫除，10分钟后以80米/分钟的平均速度步行前往，问小明等同学出发几分钟以后能追赶上小丽他们？
<gadget id="calculator">60 * 10</gadget>
<output>600</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<result>30</result>