Seven friends P, Q, R, S, T, U and V, each has a different height. P is taller than only U and R. R is taller than U. Q is taller than S but shorter than T. T is not the tallest among all. The height of how many people is between the heights of Q and R?

2

1) P is taller than only U and R 

⇒ P > U and R 

2) R is taller than U 

⇒ P > R > U

3) Q is taller than S but shorter than T 

⇒ T > Q > S

4) T is not the tallest among all 

So, the correct order will be ⇒ V > T > Q > S > P > R > U 

So, there are two persons between Q and R.