In the second quarter, the road construction team finished repairing a section of road in three months. In April, 30% of the total length was repaired, in May, 1.2 kilometers were repaired, and in June, 1/2 of the total length was repaired. What is the total length of this road in kilometers? ?
修路队第二季度三个月修完一段公路，4月份修了全长的30%，5月份修了1.2千米，6月份修了全长的(1/2)，这段公路全长多少千米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (3/10) - (1/2)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1.2 / (1/5)</gadget>
<output>6</output>

<result>6</result>