The time on the clock is 3:30, what is the angle formed by the hour and minute hands?
钟面上的时刻是3：30，这时时针和分针形成的夹角是多少°．
<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>