The starting price of a taxi in a certain city is 8 yuan (within 3 kilometers), and the price is 2.8 yuan per kilometer for the part exceeding 3 kilometers. Xiaojing paid a total of 20.6 yuan for the fare from home to aunt's house. How many kilometers is it from Xiaojing's house to aunt's house?
某市出租车起步价为8元(3千米以内)，超过3千米的部分，每千米为2.8元．小靖从家到姑姑家共付车费20.6元，小靖家到姑姑家有多少千米？
<gadget id="calculator">20.6 - 8</gadget>
<output>12.6</output>

<gadget id="calculator">12.6 / 2.8</gadget>
<output>4.5</output>

<gadget id="calculator">3 + 4.5</gadget>
<output>7.5</output>

<result>7.5</result>