At 3 o'clock, what is the angle between the minute hand and the hour hand on the clock face?
3点时，钟面上分针与时针的夹角是多少°
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>