How much does the hour hand rotate clockwise around "O" from "12" o'clock to "2" o'clock.
时针从"12"点绕"O"顺时针旋转多少到"2"点．
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<result>60</result>