A road repair team builds a road. It repairs (3/5) kilometers on the first day, and (7/20) kilometers on the second day. There is still (2/5) kilometers left. What is the total length of this road? km?
一个修路队修一条公路，第一天修了(3/5)千米，第二天修了(7/20)千米，还剩菜下(2/5)千米，这条路全长多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) + (7/20) + (2/5)</gadget>
<output>27/20 = around 1.35</output>

<result>27/20 = around 1.35</result>