How many degrees does the hour hand rotate from 3:00 to 9:00
从3：00到9：00，时针旋转了多少°
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<gadget id="calculator">6 * 30</gadget>
<output>180</output>

<result>180</result>