Seven boxes, P, Q, R, S, T, Y and Z, are kept one over the other but not necessarily in the same order. T is kept second from the top. Only three boxes are kept between P and T. Y is kept at one of the positions below P. Only Q is kept between T and R. S is kept at one of the positions above T. How many boxes are kept between R and Y?

Seven boxes, A, B, C, D, I, J and K, are kept one over the other, but not necessarily in the same order. Only two boxes are kept below I. Only one box is kept above J. Only one box is kept between J and K. B is kept immediately above C. D is kept at some place below A. How many boxes are kept between A and B?

Seven boxes C, D, E, F, K, L and M are kept one over the other but not necessarily in the same order. K is kept immediately above C. M is kept immediately above L. Only F is kept above D. Only two boxes are kept above K. M is not kept at the third position from the bottom. How many boxes are kept between E and F?