Parking in a parking lot costs at least 3 yuan. If you park for more than 2 hours, you will have to pay 1.10 yuan for each additional hour (less than 1 hour is counted as 1 hour). Xiao Wang paid 7.40 yuan when he left the parking lot. How many hours does he park in this parking lot?
在一个停车场停车至少要交费3元．如果停车超过2小时，每多停一小时要多交1.10元(不足1小时按1小时计)．小王在离开这个停车场时交了7.40元．他在这个停车场停车几小时？
<gadget id="calculator">7.4 - 3</gadget>
<output>4.4</output>

<gadget id="calculator">4.4 / 1.1</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<result>6</result>