Which of the following boxes is placed exactly in the middle?

Read the given information carefully and answer the questions given beside: Nine boxes named J, K, L, P, Q, R, W, X and Y are placed one above other but not necessarily in the same order. Only five boxes are placed between J and
L. Q is placed immediate above
L. Only three boxes are placed between Q and P. Number of boxes placed between J and P is same as between K and Q. R is placed below K, but not at bottom. Not less than four boxes are placed between Q and R. One box is placed between R and W. Box Y is placed above box
X.