The road repair team has built a road, and it has been repaired (2/5), and half of the task can be completed by repairing another 300 meters. How many meters is this road?
修路队修一条路，已经修了(2/5)，再修300米可以完成任务的一半．这条路长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

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

<gadget id="calculator">300 / (1/10)</gadget>
<output>3_000</output>

<result>3_000</result>