The starting price of a taxi is 10 yuan, and after 2 kilometers, the fee is 1.8 yuan per kilometer. Xiaohong took a taxi from home to school, and it cost 25.3 yuan. It is a kilometer from her home to school.
出租车的起步价是10元，2千米后按每千米1.8元收费，小红乘车从家去学校，用了25.3元，她家到学校有千米．
<gadget id="calculator">25.3 - 10</gadget>
<output>15.3</output>

<gadget id="calculator">15.3 / 1.8</gadget>
<output>8.5</output>

<gadget id="calculator">8.5 + 2</gadget>
<output>10.5</output>

<result>10.5</result>