What is the angle between the hour and minute hands on the face at 3:30?
3时30分钟面上时针与分针之间的夹角是多少°
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">15 + 60</gadget>
<output>75</output>

<result>75</result>