The engineering team repaired a road. It was 2/5 of the full length in the first week, 5 kilometers in the second week, and 4 kilometers in the third week. How long is the road in kilometers?
工程队修一条路，第一周修全长的(2/5)，第二周修了5千米，第三周修了4千米正好修完，这条路全长多少千米？
<gadget id="calculator">5 + 4</gadget>
<output>9</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">9 / (3/5)</gadget>
<output>15</output>

<result>15</result>