A certain engineering team repaired a road, originally planned to repair 4.2 kilometers per day, and completed the repair in 15 days. In fact, 7 kilometers are repaired every day, how many days are actually repaired?
某工程队修一条路，原计划每天修4.2千米，15天修完．实际每天修7千米，实际多少天修完？
<gadget id="calculator">15 / 7</gadget>
<output>15/7 = around 2.142857</output>

<gadget id="calculator">4.2 * (15/7)</gadget>
<output>9</output>

<result>9</result>