To build a canal, the original plan was to build 0.25 kilometers per day and finish it in 12 days. The actual repair was 0.05 kilometers more than the plan every day. How many days did it actually take to complete the canal?
修一条水渠，原计划每天修0.25千米，12天修完．实际每天比计划多修0.05千米，修完这条水渠实际用了多少天？
<gadget id="calculator">0.25 + 0.05</gadget>
<output>0.3</output>

<gadget id="calculator">12 / 0.3</gadget>
<output>40</output>

<gadget id="calculator">0.25 * 40</gadget>
<output>10</output>

<result>10</result>