Answer-Which of the following box kept on shelf 5?

We have, Box U has kept two shelves above box Q. Box X has kept immediately below box Q and kept at an even number position. From the above condition, there are two possibilities. Again we have, Box V has kept above Box S. At least three boxes are kept between V and S. From the above condition, case2 and case2a get eliminated. Case1 shows the final arrangement.