From 12:00 to 12:15, how many degrees the minute rotates.
从12：00到12：15，分钟旋转了多少度．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">360 * (1/4)</gadget>
<output>90</output>

<result>90</result>