A road engineering team repaired a road, originally planned to repair 7.2 kilometers per day, and completed the repair in 15 days. Now it repairs 1.8 kilometers more than the original plan every day. How many days can it actually be completed?
某公路工程队修一条公路，原计划每天修7.2千米，15天修完．现在每天比原计划多修1.8千米．实际多少天可以修完？
<gadget id="calculator">7.2 * 15</gadget>
<output>108</output>

<gadget id="calculator">7.2 + 1.8</gadget>
<output>9</output>

<gadget id="calculator">108 / 9</gadget>
<output>12</output>

<result>12</result>