Teacher Wang went to bed at 11 o'clock in the evening and got up at 6:30 the next morning. How many hours did Teacher Wang sleep in total?
王老师晚上11时睡觉，第二天早上6时半起床，王老师一共睡了多少小时．
<gadget id="calculator">1 + 6.5</gadget>
<output>7.5</output>

<result>7.5</result>