In the earthquake area, a life channel was rushed to repair, 40% of it was repaired on the first day, and 250 meters was repaired on the second day. A total of 80% of this road was built in two days. How many meters is the total length of this life channel?
震区抢修一条生命通道，第一天修了40%，第二天修了250米．两天共修了这条路的80%，这条生命通道全长是多少米？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">250 / (2/5)</gadget>
<output>625</output>

<result>625</result>