Study the following information carefully and answer the question given below: Eight people viz. P, Q, R, S, T, U, V and W are sitting in a straight l...

Study the following information carefully and answer the question given below: Eight people viz. P, Q, R, S, T, U, V and W are sitting in a straight line. They all are facing north. Each one of them has a different age i.e. 8, 11, 15, 17, 21, 25, 27 and 30 year, but not necessarily in the same order. The following conditions are given below. P sits one of the extreme ends of the row. There are three person sits between P and the one, who is 11 year old. R sits third to the left of the person, who is 17 year old. The person, who is 17 year old, is not immediate neighbour of the person, who is 11 year old. R is not 11 year old. P is not 17 year old. Q is 15 year old. S is not the youngest person. R is older than P but his age is a not whole square number. There are as many person sits between P and R is same as the person sits between W and the person, who is 30 year old. * T sits immediate left of the person, who is 8 year old. Q sits third to the left of S. Youngest person sits extreme right end of the row. Persons,who sits left of W are younger than W. U is older than V.Q does not sit at extreme left end.
Question: How many people sit between the person who is 25 years old and the person who sits immediately to the right of U?