Taxi regulations in a certain city: 6 yuan within 3 kilometers (including 3 kilometers). The part exceeding 3 kilometers is 1.8 yuan per kilometer. Mr. Zhang paid 14.1 yuan for a taxi ride. How far was Mr. Zhang’s journey by car this time?
某市出租车规定：起步3千米以内(包括3千米)6元．超过3千米的部分每千米1.8元．张老师某次坐出租车付了14.1元，张老师此次坐车的路程是多少？
<gadget id="calculator">14.1 - 6</gadget>
<output>8.1</output>

<gadget id="calculator">8.1 / 1.8</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 + 3</gadget>
<output>7.5</output>

<result>7.5</result>