Wang Hong arrives at school at 7:40 in the morning, leaves school at 11:40, arrives at school at 2:30 pm, and leaves school at 5:30. How many hours does she spend in school every day?
王红每天早晨7时40分到校，11时40分放学，下午2时30分到学校，5时30分放学，她一天在学校的时间是多少小时
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<result>7</result>