A certain engineering team repaired a road, 30% of the whole journey was repaired in the first week, 210km was repaired in the second week, and half of the whole journey was repaired in two weeks. How many kilometers is the total length of this road?
某工程队修一条路，第一周修了全程的30%，第二周修了210km，两周正好修了全程的一半，这条路全长多少千米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">210 / (1/5)</gadget>
<output>1_050</output>

<result>1_050</result>