To build a road, (2/5) kilometers were built on the first day, and (1/6) kilometers were repaired less on the second day than on the first day. How many kilometers were repaired in two days?
修一条公路，第一天修了(2/5)千米，第二天比第一天少修了(1/6)千米，两天一共修多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/5) - (1/6)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(2/5) + (7/30)</gadget>
<output>19/30 = around 0.633333</output>

<result>19/30 = around 0.633333</result>