Study the following information to answer the given questions.

J, K, L, M, P, Q and R are seated in a straight line facing north, with equal distance between each other but not necessarily in the same order.

P sits third to the left of K. Q sits second to the right of K.

L sits third to the right of R. R does not sit at any of the extreme ends of the line.

Only one person sits between R and J.

How many persons are seated between R and Q?