The charging standard of a taxi in a certain city is: the starting price is 10 yuan (that is, 10 yuan is required if the driving distance does not exceed 3 kilometers). The taxi traveled a total of 5 kilometers from school to home. How much does Teacher Li have to pay?
某市出租车的收费标准是：起步价10元(即行驶距离不超过3千米都需付10元)，超过3千米后，每增加1千米加收2.5元，李老师乘坐这种出租车从学校到家共行驶了5千米，李老师要付多少钱？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<result>15</result>