Before the "Aquarium" opened, there were already 150 children queuing up. After the start of ticket checking, there will be the same number of children coming to line up every minute. A ticket gate can check 30 people per minute. If there is only one ticket gate, no one will line up after 10 minutes of ticket checking, and if two ticket gates are opened, no one will line up after a few minutes?
"海洋馆"开门前已经有150名小朋友在排队．检票开始后，每分钟又有数量相同的小朋友前来排队．一个检票口每分钟能检票30人．如果只有一个检票口，检票开始10分钟后就没有人排队，如果开两个检票口，几分钟后就没有人排队？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">300 - 150</gadget>
<output>150</output>

<gadget id="calculator">150 / 10</gadget>
<output>15</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">300 / 45</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>