The taxi fare in Xinghua 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 Bookstore and paid 10.7 yuan in total. How much does it cost from his home to Bookstore km?
兴化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10.7元，他家到书城大约多少千米？
<gadget id="calculator">10.7 - 8</gadget>
<output>2.7</output>

<gadget id="calculator">2.7 / 1.8</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 + 3</gadget>
<output>4.5</output>

<result>4.5</result>