A certain city stipulates that the taxi charges 8 yuan for the first 3 kilometers, and 2.4 yuan for each kilometer thereafter. Teacher Li takes a taxi from home to school for 22.4 yuan. How many kilometers is the total distance from teacher Li’s home to school?
某市规定出租车前3千米收费8元，以后每千米收2.4元，李老师乘出租车￥从家到学校共用去22.4元，李老师家到学校共多少千米？
<gadget id="calculator">22.4 - 8</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 / 2.4</gadget>
<output>6</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<result>9</result>