A parking lot stipulates that one time parking fee is 5 yuan (within 2 hours), and the part exceeding 2 hours will be charged 1.5 yuan per hour. Xiaojun's father parked here and paid a total parking fee of 9.5 yuan. How many hours did he park this time?
某停车场规定：停车一次收费5元(2小时以内)，超过2小时的部分，每小时加收1.5元．小军的爸爸在此停车共交停车费9.5元，问爸爸这次共停车多少小时？
<gadget id="calculator">9.5 - 5</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 / 1.5</gadget>
<output>3</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<result>5</result>