The engineering team is building a road, and plans to build 2.4 kilometers per day, which will be completed in 12 days. Actually repairing 3.6 kilometers every day, how many days can be saved?
工程队修一条路，计划每天修2.4千米，12天修完．实际每天修3.6千米，可以少修多少天？
<gadget id="calculator">2.4 * 12</gadget>
<output>28.8</output>

<gadget id="calculator">28.8 / 3.6</gadget>
<output>8</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<result>4</result>