What is the angle between the hour hand and the minute hand at 3:15?
3点15分时针与分针成多少度的角．
<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>