The taxi fare standard in a certain place is as follows: if the ride does not exceed 2km, the fee is 5 yuan; for the part exceeding 2km, an additional 1.2 yuan is charged for every kilometer. Uncle Li paid 23 yuan for a taxi ride. How many kilometers did he travel by car?
某地的出租车收费标准为：乘车不超过2km的，收费5元；超过2km的部分每千米加收1.2元．李叔叔一次乘出租车付费23元，他乘车走了多少千米？
<gadget id="calculator">23 - 5</gadget>
<output>18</output>

<gadget id="calculator">18 / 1.2</gadget>
<output>15</output>

<result>15</result>