The charging standard of a taxi in a certain city is: 8 yuan within 3 kilometers, and 1.8 yuan per kilometer beyond 3 kilometers. On Saturday, Yang Hong took a taxi from home to Book City and paid a total of 17 yuan. How much is his home to Book City? rice?
某市出租车的收费标准是：3千米以内收费8元，3千米以外每千米收费1.8元，周六杨红从家打车去书城共付了17元，他家到书城大约多少千米？
<gadget id="calculator">17 - 8</gadget>
<output>9</output>

<gadget id="calculator">9 / 1.8</gadget>
<output>5</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<result>8</result>