In the South-to-North Water Diversion Project, a 8.4-kilometer canal is planned to be repaired for one month (calculated in 30 days), but the actual repair is 0.14 kilometers more than planned every day. How many days can it actually be completed?
南水北调工程中，一段成8.4千米的水渠计划修一个月(按30天计算)，实际每天比计划多修0.14千米，实际多少天可以完工？
<gadget id="calculator">8.4 / 30</gadget>
<output>0.28</output>

<gadget id="calculator">0.28 + 0.14</gadget>
<output>0.42</output>

<gadget id="calculator">8.4 / 0.42</gadget>
<output>20</output>

<result>20</result>