The road construction team planned to build a section of road. The first phase of the project completed (1/3) of the plan, and the second phase of the project completed (3/7) of the plan. The second phase of the project was 100 meters longer than the first phase of the project. How many meters is this road?
修路队计划修一段公路，第一期工程完成了计划的(1/3)，第二期工程完成了计划的(3/7)，第二期工程比第一期工程多修100米．这段公路长多少米？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/7) - (1/3)</gadget>
<output>2/21 = around 0.095238</output>

<gadget id="calculator">100 / (2/21)</gadget>
<output>1_050</output>

<result>1_050</result>