The taxi billing rules in a certain city are as follows: the journey does not exceed 3 kilometers, the starting fare is 9 yuan, and the excess is 1.2 yuan per kilometer. One day, Teacher Li and three classmates took a taxi from the school to the Children's Palace and paid a total of 18.60 yuan. How far is the distance from the school to the Children's Palace?
某市出租车计费规则如下：行程不超过3千米，收起步价9元，超过部分每千米路程收费1.2元．某天李老师和三位同学从学校乘坐出租车到少年宫，共付了18.60元，学校到少年宫的路程有多远？
<gadget id="calculator">18.6 - 9</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 / 1.2</gadget>
<output>8</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<result>11</result>