The starting price of a taxi in a certain city is 5 yuan, and every kilometer after 2 kilometers is charged at 1.8 yuan. Teacher Wang spent 21.2 yuan in a taxi from the school to the library today. How many kilometers is it from the school to the library?
某市出租车起步价是5元，2千米以后每千米按1.8元计费，王老师今天从学校到图书馆搭出租车花了21.2元，问学校到图书馆有多少千米？
<gadget id="calculator">21.2 - 5</gadget>
<output>16.2</output>

<gadget id="calculator">16.2 / 1.8</gadget>
<output>9</output>

<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<result>11</result>