The road construction team repaired a section of 0.8km long road, and repaired the full length (2/5) on the first day. The next day I repaired the full length (3/8). How many kilometers did you build in two days?
修路队修一段长0.8km的公路，第一天修了全长的(2/5)．第二天修了全长的(3/8)．两天一共修了多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(2/5) + (3/8)</gadget>
<output>31/40 = around 0.775</output>

<gadget id="calculator">0.8 * (31/40)</gadget>
<output>0.62</output>

<result>0.62</result>