At 4:30, what is the angle between the hour and minute hands?
4时30分，时针和分针的夹角是多少度．
<gadget id="calculator">30 * 1</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 + 15</gadget>
<output>45</output>

<result>45</result>