What is the minimum angle between the hour and minute hands of a wall clock at 3:15?
一个挂钟在3点15分的时候，时针与分针的最小夹角是多少度．
<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<gadget id="calculator">15 * 0.5</gadget>
<output>7.5</output>

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

<gadget id="calculator">7.5 - 90</gadget>
<output>-82.5</output>

<gadget id="calculator">90 + (-82.5)</gadget>
<output>7.5</output>

<result>7.5</result>