It is planned to build a canal of 0.48 kilometers per day, and it will be completed in 15 days. In fact, an extra 0.12 kilometers will be built per day. How many days will it actually take to complete the canal? (Solve with ratio)
修一条水渠计划每天修0.48千米，15天修完，实际每天多修0.12千米，修完这条水渠实际用多少天？(用比例解)
<gadget id="calculator">0.48 * 15</gadget>
<output>7.2</output>

<gadget id="calculator">0.48 + 0.12</gadget>
<output>0.6</output>

<gadget id="calculator">7.2 / 0.6</gadget>
<output>12</output>

<result>12</result>