road construction team repaired (17/20) kilometers on the first day, and (1/20) kilometers less on the first day than on the second day, and (1/5) of the road was repaired on the second day. How long is this road in kilometers?
一个修路队，第一天修了(17/20)千米，第一天比第二天少修(1/20)千米，第二天修了这条路的(1/5)．这条路全长多少千米？
<gadget id="calculator">17 / 20</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(17/20) + (1/20)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(9/10) / (1/5)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>