NIMCET 2015 Question Paper with solutions

P, Q, R, S, T, U and V are sitting in a row facing North. In order to determine, who is sitting exactly in the middle of the row, which of the following information is needed ?
I) T and u are sitting at extreme ends of the row.
II) S is third to the right of T.
III) Q is four places to the left of R and P is two places to the left of V.