What is the angle between the hour and minute hands at 6:20?
6点20分时针和分针的夹角是多少度．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">0.5 * 20</gadget>
<output>10</output>

<gadget id="calculator">60 + 10</gadget>
<output>70</output>

<result>70</result>