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Four person K,L,M and N are initally at ...

Four person K,L,M and N are initally at the corners of a square of side of length d. If every person starts moving, such that K always heads towards L, L heads towards M, M heads directly towards N and N heads towards K, then the four perons will meet after

A

`d/v sec`

B

`(sqrt2d)/v sec`

C

`d/(sqrt2v) sec`

D

`d/(2v) sec`

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