Teacher Wang arrives at school at 7:30 every day and leaves at 5:30 pm. Take a 2-hour break at noon, how many hours does Mr. Wang work every day?
王老师每天7：30到校，下午5：30离校．中午休息2小时，王老师每天工作多少小时．
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>