To build a road, the original plan is to build 0.5 kilometers per day, and it will be completed in 40 days. The actual daily construction is 0.3 kilometers more than the original plan. How many days will it actually be completed?
修一条公路，原计划每天修0.5千米，40天完成，实际每天比原计划多修0.3千米，实际多少天完成？
<gadget id="calculator">0.5 + 0.3</gadget>
<output>0.8</output>

<gadget id="calculator">40 / 0.8</gadget>
<output>50</output>

<gadget id="calculator">0.5 * 50</gadget>
<output>25</output>

<result>25</result>