The traffic light at a certain intersection changes every 30 seconds. From 7:00 am to 7:50 am, how many times does this signal light change?
某路口的交通信号灯每30秒转换一次，从上午7时到7时5分，这个信号灯转换了多少次．
<gadget id="calculator">300 / 30</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>