Uncle Li paid 12.5 yuan in the parking lot, 2.5 yuan for 1 hour, and 2.5 yuan for every hour beyond 1 hour. How many hours does Uncle Li park in this parking lot?
李叔叔在停车场交了12.5元，1小时内收费2.5元，超过1小时每小时收费2.5元，李叔叔在这个停车场停车几小时？
<gadget id="calculator">12.5 - 2.5</gadget>
<output>10</output>

<gadget id="calculator">10 / 2.5</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>