A road construction team built a road, and built 3.6 kilometers on the first day, which was 0.4 kilometers more than the second day. How many kilometers did you build in total in two days?
某修路队修筑一条公路，第一天修了3.6千米，比第二天多修0.4千米．两天共修多少千米？
<gadget id="calculator">3.6 - 0.4</gadget>
<output>3.2</output>

<gadget id="calculator">3.2 + 3.6</gadget>
<output>6.8</output>

<result>6.8</result>