The Shanghai-Hangzhou Expressway and a section of road are being repaired. It is planned to repair 90 meters per day and complete the task in 40 days. The actual repair is 30 meters more than planned every day. How many days can the task be completed in advance?
沪杭高速公路与一段道路进行维修，计划每天维修90米，40天完成任务，实际每天比计划多修30米，实际可提前几天完成任务？
<gadget id="calculator">90 * 40</gadget>
<output>3_600</output>

<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<gadget id="calculator">3_600 / 120</gadget>
<output>30</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<result>10</result>