At 8:30 on the clock, what is the angle between the minute hand and the hour hand?
钟表上8：30分时，分针与时针的夹的角是多少度．
<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>