After 4 hours, how many degrees has the hour hand rotated on the needle plane?
经过4小时，时针在针面上旋转了多少度．
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

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

<result>120</result>