From 4:00 to 4:15, how many degrees did the minute hand turn?
从4点到4点一刻，分针转动了多少度．
<gadget id="calculator">360 / 60</gadget>
<output>6</output>

<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<result>90</result>