Answer-How many persons stand between Q and V?

1 Not more than two persons stand to the left of U. The number of persons to the right of U is the same as to the left of W, who stands third to the right of X. Case-1 2 V stands fourth from one of the ends and is to the immediate right of P. The number of persons between U and P is the same as the number of persons between X and T. The consecutive alphabetically named person doesnt stand adjacent to each other. Hence, case 3 gets eliminated.