No. 1 bus departs from the station every 15 minutes. How many No. 1 buses have been driven from the first bus at 7:00 am to 10:00 am.
车站每15分钟开出一辆1路公交车，从上午7时开出第一辆车开始，到10时一共开出了多少辆1路公交车．
<gadget id="calculator">60 / 15</gadget>
<output>4</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">120 + 1</gadget>
<output>121</output>

<result>121</result>