A road repair team repairs a section of railway. The original plan was to repair 3.5 kilometers per day and finish it in 12 days. Actually repair 6 kilometers per day. How many days can it be finished?
一个修路队修一段铁路．原计划每天修3.5千米，12天修完．实际每天修6千米．多少天可以修完？
<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">3.5 * 2</gadget>
<output>7</output>

<result>7</result>