When Xiao Ming went out at 4:00 p.m., the angle between the hour and minute hands of the watch was 110 degrees; when he returned home before 5:00 p.m. that day, the angle between the two hands of the watch was also 110 degrees. How long has he been away?
小明下午4点多外出时，手表时针和分针的夹角是110度；当天下午5点前回家，手表两针的夹角也是110度．问他外出了多久？
<gadget id="calculator">220 * 30</gadget>
<output>6_600</output>

<gadget id="calculator">360 - 30</gadget>
<output>330</output>

<gadget id="calculator">6_600 / 330</gadget>
<output>20</output>

<gadget id="calculator">20 / 30</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 60</gadget>
<output>40</output>

<result>40</result>