The engineering team planned to build a road. The original plan was to build 720 meters per day, but the actual daily repair was 80 meters more than the original plan. Therefore, the task was completed 3 days ahead of schedule. How long is this road in kilometers?
工程队计划修一条公路，原计划每天修720米，实际每天比原计划多修80米．因而提前3天完成任务．这条路全长多少千米？
<gadget id="calculator">720 * 3</gadget>
<output>2_160</output>

<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">2_160 + 240</gadget>
<output>2_400</output>

<gadget id="calculator">80 - 720</gadget>
<output>-640</output>

<gadget id="calculator">720 + (-640)</gadget>
<output>80</output>

<gadget id="calculator">2_400 / 80 / 1_000</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">720 * (3/100)</gadget>
<output>108/5 = around 21.6</output>

<result>108/5 = around 21.6</result>