The construction team repaired a road, and repaired the full length (1/4) in the first week, and repaired the full length (2/5) in the second week, and repaired 1200 meters more in the second week than in the first week. How long is this road in meters?
工程队修一条路，第一周修了全长的(1/4)，第二周修了全长的(2/5)，第二周比第一周多修了1200米．这条公路全长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1_200 / (3/20)</gadget>
<output>8_000</output>

<result>8_000</result>