Four persons K,L,M,N are initially at the four corners of a square of side d. Each person now moves with a uniform speed v in such a way that K always moves directly towards M, M directly towards N, and N directly towards K. The four persons will meet at a time
![](https://sahay.guru/wp-content/uploads/2021/02/90-1-1-1024x309.jpg)
![](https://sahay.guru/wp-content/uploads/2021/02/90-2-1-1024x676.jpg)
![](https://sahay.guru/wp-content/uploads/2021/02/90-3-1024x394.jpg)