You need to pay at least 0.5 yuan for one parking in a parking lot. If you park for more than 1 hour, you need to pay 0.5 yuan more for every 0.5 hours you park. A car pays a parking fee of 5.5 yuan when it leaves the parking lot. How long has the car been parked?
在一个停车场上停车一次至少要交0.5元，如果停车超过1小时，每多停0.5小时要多交0.5元．一辆汽车在离开停车场时交了5.5元停车费，这辆汽车停了几时？
<gadget id="calculator">5.5 - 0.5</gadget>
<output>5</output>

<gadget id="calculator">0.5 / 0.5</gadget>
<output>1</output>

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

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>