A certain engineering team built a road. The first phase of the project repaired the full length (1/2), and the second phase repaired the rest (2/5), leaving 800 meters. How long is this road?
某工程队修一条路，第一期工程修了全长的(1/2)，第二期修了余下的(2/5)，还剩下800米，这段路有多长？
<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">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">800 / (3/5) / (1/2)</gadget>
<output>8_000/3 = around 2_666.666667</output>

<result>8_000/3 = around 2_666.666667</result>