The starting price of a taxi fare in a certain city is 5 yuan within 3 kilometers, and the meter will increase by 0.6 yuan for every 0.5 kilometers thereafter. Now a person takes a taxi from A to B and pays a total of 12.20 yuan. If the person walks 300 meters from place A to place B, and then takes a taxi, he also needs to pay 12.20 yuan for the taxi. Yuan?
某市出租车车费的起步价是3千米以内都是5元，往后每增加0.5千米，计价器就增加0.6元．现在有一人从甲地到乙地乘出租车共支付车费12.20元．如果这个人从甲地到乙地先步行300米，然后再乘出租车，也要支付车费12.20元，那么坐出租车从甲地到甲、乙两地的中点需支付出租车费多少元？
<gadget id="calculator">12.2 - 5</gadget>
<output>7.2</output>

<gadget id="calculator">7.2 / 0.6</gadget>
<output>12</output>

<gadget id="calculator">12 * 0.5</gadget>
<output>6</output>

<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) - 3</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) / 0.5</gadget>
<output>3</output>

<gadget id="calculator">3 * 0.6</gadget>
<output>1.8</output>

<gadget id="calculator">5 + 1.8</gadget>
<output>6.8</output>

<result>6.8</result>