Q: 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 L, L directly towards M, M directly towards N and N directly towards K. The four persons will meet at a time …………
Ans: d/v
Sol: Initially distance between two person = d
Relative velocity of approach = v + v cos90o = v
The person will meet after time , t = d/v