At 10:40, what is the angle between the hour hand and the minute hand?
10点40分时，时针与分针的夹角是多少度．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">0.5 * 40</gadget>
<output>20</output>

<gadget id="calculator">60 + 20</gadget>
<output>80</output>

<result>80</result>