A middle school plans to build a 400-meter runway within 14 days. Half of the task was completed in the first 9 days. How many meters must be repaired every day to complete the task on time?
某中学计划在14天内修一条400米的跑道，前9天完成了任务的一半，以后每天至少要修多少米，才能按时完成任务？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">14 - 9</gadget>
<output>5</output>

<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<result>40</result>