There was a locust disaster in a piece of farmland. Its shape is similar to a parallelogram, its base is 850 meters long and its height is 320 meters. At least how long will it take to wipe out all the locusts on this farmland?
有一块农田发生蝗虫灾害，它的形状近似平行四边形，底长850米，高320米，如果用机器喷药的方式消灭蝗虫，每小时能消灭1.6公顷农田上的蝗虫，照这样计算，要将这块农田上的蝗虫全部消灭，至少要用多长时间？
<gadget id="calculator">320 / 10_000 / 1.6</gadget>
<output>0.02</output>

<gadget id="calculator">850 * 0.02</gadget>
<output>17</output>

<result>17</result>