road is 216 meters long. It was originally planned to be completed in 18 days, but it took 6 days less. How many meters of road are actually built every day?
一条路长216米，原计划18天修完，实际少用了6天．实际每天修路多少米？
<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<gadget id="calculator">216 / 12</gadget>
<output>18</output>

<result>18</result>