A factory works from 6:00 to 11:00 in the morning and from 2:00 to 6:00 in the afternoon. What are the working hours for the whole day?
某工厂上午的工作时间是6时～11时，下午的工作时间是2时～6时，全天的工作时间是多少？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<result>9</result>