One car leaves every 10 minutes at the bus station, how many cars leave in half an hour.
公交车站每隔10分钟开出1辆车，半小时共开出多少辆车．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>