The starting price of a taxi in a certain city is 7 yuan (distance within 3 kilometers), and the fare is 1.2 yuan/km for a distance exceeding 3 kilometers. Xiaohua took a taxi from home to the gymnasium and paid a total of 21.4 yuan. How many kilometers is the distance from Xiaohua's home to the gymnasium?
某市出租车起步价为7元(路程在3千米以内)，超过3千米的路程，按1.2元/千米计费．小华坐出租车从家去体育馆，一共付车费21.4元．小华家到体育馆的路程大约有多少千米？
<gadget id="calculator">21.4 - 7</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 / 1.2</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<result>15</result>