The starting price of a taxi in a city is 8 yuan (within 3 kilometers), and the average price is 1.8 yuan per kilometer for more than 3 kilometers. Dongdong’s fare to the supermarket is 13.4 yuan. How far is Dongdong’s from the supermarket?
某市出租车起步价为8元(3千米以内)，超过3千米，平均每千米1.8元，东东家到超市付车费13.4元，东东家离超市有多远？
<gadget id="calculator">13.4 - 8</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 / 1.8</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<result>6</result>