An engineering team contracted the installation task of a tap water pipeline. The original plan was to install 0.48 kilometers per day, and the installation was completed in 15 days. The actual installation is 0.12 kilometers more per day, how many days has it actually been installed?
某工程队承包一条自来水管道的安装任务，原计划每天安装0.48千米，15天安装完．实际每天多安装0.12千米，实际安装了几天？
<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>