When the time indicated by the clock is 10:20, what is the angle formed by the hour hand and the minute hand?
当钟表所指时间是10点20分时，时针与分针所成夹角是多少度．
<gadget id="calculator">6 * 30</gadget>
<output>180</output>

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

<gadget id="calculator">180 - 10</gadget>
<output>170</output>

<result>170</result>