At 9 o'clock in the morning, what is the angle between the hour hand and the minute hand?
上午9时，时针与分针的夹角是多少°
<gadget id="calculator">360 / 60</gadget>
<output>6</output>

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

<result>90</result>