Ou Ou and Xiao Mei go to the cinema from school to watch a movie at the same time. Eight minutes after they set off, Ou Ou realized that he forgot to take the movie ticket, so he hurried back to school to get the movie ticket and then chased Xiaomei. It is known that Oou walks 80 meters per minute, and Xiaomei walks 60 meters per minute. Then, how many minutes after Xiaomei set off did Oou catch up with Xiaomei.
欧欧与小美同时从学校去电影院观看电影．当他们出发8分钟后，欧欧发现忘记拿电影票，于是赶紧返回学校拿电影票再追赶小美．已知欧欧每分钟走80米，小美每分钟走60米．那么，欧欧在小美出发后多少分钟追上小美．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

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

<gadget id="calculator">16 / 20</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<gadget id="calculator">48 + 16</gadget>
<output>64</output>

<result>64</result>