How many degrees does the pointer on the clock face rotate clockwise from 9 to 11?
钟面上的指针顺时针从9到11旋转了多少度．
<gadget id="calculator">11 - 9</gadget>
<output>2</output>

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

<result>60</result>