At 2:30 on the clock face, what is the angle between the hour and minute hands?
钟面上2时30分，时针与分针所夹的角是多少．
<gadget id="calculator">30 * 6</gadget>
<output>180</output>

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

<gadget id="calculator">30 * 0.5</gadget>
<output>15</output>

<gadget id="calculator">180 - 60 - 15</gadget>
<output>105</output>

<result>105</result>