The road construction team builds a road. The full length (2/5) was repaired on the first day, (3/4) kilometers were repaired on the second day, and there are 3 kilometers left. How long is this road in kilometers?
筑路队修一条公路．第一天修了全长的(2/5)，第二天修了(3/4)千米，还剩3千米．这条路全长多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) + 3</gadget>
<output>15/4 = around 3.75</output>

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

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(15/4) / (3/5)</gadget>
<output>25/4 = around 6.25</output>

<result>25/4 = around 6.25</result>