certain river in Baoying has a history of more than 100 years, and it was the first time to fully bottom out and dredge. The entire project has a total length of 2,000 meters, an average width of 125 meters on the water surface, and an average dredging depth of nearly 1 meter. The engineering team dug 35,000 cubic meters of river bottom silt in 7 days. According to this calculation, how many days will it take to fully complete the dredging task?
宝应某河有百多年的历史，首次全面见底清淤，整个工程全长2000米，水面平均宽度125米，清淤平均深度近1米．工程队7天挖了3.5万立方米的河底淤泥，照这样计算，全面完成清淤任务大约要多少天？
<gadget id="calculator">3.5 * 10_000</gadget>
<output>35_000</output>

<gadget id="calculator">35_000 / 7</gadget>
<output>5_000</output>

<gadget id="calculator">1 / 5_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">2_000 * 125 * (1/5_000)</gadget>
<output>50</output>

<result>50</result>