62.5% of a road has been repaired. At this time, it exceeds 800 meters from the midpoint. What is the total length of this road?
修一条马路，已修62.5%，这时超过中点800米，这条马路全长多少米？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">0.625 - (1/2)</gadget>
<output>0.125</output>

<gadget id="calculator">800 / 0.125</gadget>
<output>6_400</output>

<result>6_400</result>