In a car park, you have to pay at least 1 yuan for parking once. If you park for more than 2 hours, you will have to pay 0.1 yuan for each additional hour. A car paid 1.4 yuan when it left the parking lot. How many hours has this car been parked?
在一个汽车场，停车一次最少要交费1元．如果停车超过2小时，每多停1小时要交0.1元．一辆汽车在离开停车场时交了1.4元．这辆汽车停了几小时？
<gadget id="calculator">1.4 - 1</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 / 0.1</gadget>
<output>4</output>

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

<result>6</result>