The exhibition time of the science and technology exhibition hall is from 8:00 to 11:00 every morning. What is the time of the exhibition in the morning?
科技展览馆每天上午展出的时间是8时-11时，上午展出的时间是多少．
<gadget id="calculator">11 - 8</gadget>
<output>3</output>

<result>3</result>