Taxi fare regulations in a certain city: 5 yuan within 2 kilometers, and 1.5 yuan for every 1 kilometer after more than 2 kilometers. When Uncle Wang got off the taxi, he paid a total of 12.5 yuan. How long did Uncle Wang travel in this car?
某市出租车收费规定：2千米以内5元，超过2千米以后，每1千米加收1.5元．王叔叔坐出租车下车时一共付了12.5元，王叔叔坐这次车大约行了多长的路？
<gadget id="calculator">12.5 - 5</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 / 1.5</gadget>
<output>5</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<result>7</result>