一道国外的微分题目A lighthouse is located on a small island 2 km away from_英语解答

一道国外的微分题目
A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km from (Round your answer to one decimal place.)

人气：428 ℃　时间：2020-05-14 16:37:59

解答

这道微分题目一座灯塔位于距直海岸线上的点 P最近,距离为 2 公里的一个小岛上,它的光线4圈 / 分钟.如果光束距离P点1 公里,速度是多少?(圈一个小数位的答案）.
如果我理解没错的话,答案应该是2圈/min 具体式子不太好表达答案错的哦那是3.6吗？额也不对的哦呵呵那就是我的理解有错误了不好意思没有帮上你没关系的谢谢你忙帮了