The road construction team wanted to build a 3,600-meter-long road. They planned to build 80 meters a day, but actually completed the task in 40 days. How many days earlier than planned?
修路队要修一条长3600米的公路，计划每天修80米，实际40天就完成了任务，实际比计划提前几天完成？
<gadget id="calculator">3_600 / 80</gadget>
<output>45</output>

<gadget id="calculator">45 - 40</gadget>
<output>5</output>

<result>5</result>