To build a road, 40% of the total length was built on the first day, and 35% of the total length was repaired on the second day. The first day was 300 meters longer than the second day. How many meters is this road?
修一条公路，第一天修了全长的40%，第二天修了全长的35%，第一天比第二天多修300米．这条路长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(2/5) - (7/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">300 / (1/20)</gadget>
<output>6_000</output>

<result>6_000</result>