The starting price of a taxi in city A is 8 yuan (within 3 kilometers), and the average fare for the part exceeding 3 kilometers is 2.4 yuan per kilometer. Aunt Zhang took a taxi from Xiyuan to the train station and paid a total of 15.2 yuan. How many kilometers is it from Xiyuan to the railway station?
A市出租车起步价为8元(3千米内)，超过3千米的部分，平均每千米收费2.4元．张阿姨从西苑乘出租车到火车站共付车费15.2元．西苑离火车站有多少千米？
<gadget id="calculator">15.2 - 8</gadget>
<output>7.2</output>

<gadget id="calculator">7.2 / 2.4</gadget>
<output>3</output>

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

<result>6</result>