It is given that,
Eight persons P, Q, R, S, T, U, V and W sit around a square table, but not necessarily in the same order.
One person sits at each corner and faces inwards while one person sits along each side and faces outwards.
From statement I alone:
Two persons sit between P and Q.

The neighbours of U and W faces outwards. S sits immediate to the right of T.
Thus, no definite arrangement can be established.
So, statement I alone is not sufficient to answer the question.
From statement II alone:
R faces T, who sits third to the right of V.

One person sits between P and W, who is not a neighbour of T.

Q and U are neighbours.

So, R sits second to the left of S.
So, statement II alone is sufficient to answer the question.