How many degrees does the hour hand rotate counterclockwise from the number 3 to the number 1 on the clock face?
钟面上时针从数字3逆时针旋转多少°到数字1．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<result>60</result>