A bus is dispatched every 20 minutes, from 6:00 am to 8:00 am, how many buses have been dispatched in total?
公交车每隔20分钟发一辆，从早上6点到早上8点，一共发了多少辆车．
<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>