General Studies · Vertical Box Puzzle

Seven boxes, P, Q, R, S, T, U, and V, are kept one over the other, but not necessarily in the same order. P is kept at the third position from the top. V is kept at the second position from the bottom. Only three boxes are kept between V and U. Q is kept somewhere between P and V. Only one box is kept between S and T. T is not kept in between any of the boxes. How many boxes are kept between P and T?