A parking lot requires at least 5 yuan for one parking. If you park for more than 1 hour, you need to pay 2 yuan more for every 0.5 hours you park. A car paid 19 yuan when it left the parking lot. How many hours has the car been parked?
一个停车场停车一次至少要缴5元，如果停车超过1小时，每多停0.5小时，要多缴2元．一辆车在离开停车场时缴了19元，这辆车停了几小时？
<gadget id="calculator">1 / 0.5</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">19 - 5</gadget>
<output>14</output>

<gadget id="calculator">4 + 14</gadget>
<output>18</output>

<gadget id="calculator">18 / 4</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>