The starting price of a taxi in a certain city is 8 yuan (within 2km), and the excess is 2.5 yuan per kilometer. Uncle Li paid a total of 35.5 yuan for the taxi from home to the airport. How many kilometers away is his home from the airport?
某市出租车起步价为8元(2km以内)，超过部分每千米2.5元，李叔叔从家打车到机场共付车费35.5元．他家离机场多少千米？
<gadget id="calculator">35.5 - 8</gadget>
<output>27.5</output>

<gadget id="calculator">27.5 / 2.5</gadget>
<output>11</output>

<gadget id="calculator">11 + 2</gadget>
<output>13</output>

<result>13</result>