The road construction team plans to finish building a road in April. (1/5) of the road was built in the first ten days, and 70 meters more in the middle ten days than in the first ten days. At this time, half of the road was just finished. What is the total length of this road in meters ?
筑路队计划四月份修完一条路，上旬修了这段路的(1/5)，中旬比上旬多修70米，这时，刚好修完这段路的一半，这段路全长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">70 / (1/10)</gadget>
<output>700</output>

<result>700</result>