A construction team builds a road. The full length (3/10) was repaired on the first day, and the full length (2/5) was repaired on the second day, leaving 630 meters unrepaired. How long is this road in meters?
某工程队修筑一条马路．第一天修了全长的(3/10)，第二天修了全长的(2/5)，还剩630米没有修．这条马路全长多少米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">(3/10) + (2/5)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">630 / (3/10)</gadget>
<output>2_100</output>

<result>2_100</result>