A night shift worker takes over at 11:00 p.m. and leaves at 7:00 a.m. the next day. How many hours does this shift work?
夜班工人晚上11时接班，第二天早上7时下班，这一班的工作时间是多少小时．
<gadget id="calculator">12 - 11</gadget>
<output>1</output>

<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<result>8</result>