Xiao Ming arrives at school at 7 am and leaves school at 11:30 noon. During this time, how many degrees does the hour hand rotate on the clock face?
小明上午7时到校，中午11时30分离校，在这段时间里，时针在钟面上旋转了多少度．
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

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

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">120 + 15</gadget>
<output>135</output>

<result>135</result>