After 1 hour on the clock face, the angle turned by the minute hand is different from the angle turned by the hour hand in the same time.
钟面上经过1小时，分针转过的角与同一时间内时针转过的角相差多少．
<gadget id="calculator">360 - 30</gadget>
<output>330</output>

<result>330</result>