Xiao Ming was counting the flow of people at the ticket gate of the railway station. He found that there were already some people queuing up before the start of the ticket check. Open a ticket gate, and no one will line up after 8 minutes of ticket checking. Please help Xiao Ming imagine that if two ticket gates are opened, no one will line up for how many minutes after the ticket check starts.
小明在火车站检票口作人流量统计，他发现在检票开始前已有一些人排队，检票开始后每分钟有10人前来排队检票，一个检票口每分钟能让25人通过检票进站，只开通一个检票口，检票8分钟后就没有人排队．请你帮助小明设想，如果开通两个检票口，那么检票开始后多少分钟就没有人排队了．
<gadget id="calculator">25 * 8</gadget>
<output>200</output>

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

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">120 / 40</gadget>
<output>3</output>

<result>3</result>