Working through the constraints to find positions 1-10 (left to right):
- Q is 2nd right of K → if K is at position x, Q is at x+2.
- M is 4th left of Q → M is at Q−4 = x−2.
- P is 4th right of K → P is at x+4.
- P is 2nd left of S → S is at P+2 = x+6.
- S is 5th right of N → N is at S−5 = x+1.
Trying K=3: M=1, N=4, Q=5, P=7, S=9. O is 3 positions from N(4): O=1 or O=7. M=1, P=7, so O=7 conflicts. O=1 conflicts with M. Try K=2: M=0 (invalid).
Try K=4: M=2, N=5, Q=6, P=8, S=10. For 9 seats, S=10 invalid.
Try K=3 with 10 people: M=1, N=4, Q=5, P=7, S=9. O is 3 from N: position 1 or 7. M=1, P=7 taken. Invalid.
With 10 positions: positions 1-10. K=3, M=1, N=4, Q=5, P=7, S=9. O at position 1 (taken by M) or 7 (taken by P). Hmm. Let me try: there are 10 people (K,L,M,N,O,P,Q,R,S,T). Positions 1-10.
Trying K=4: M=2, Q=6, P=8, S=10, N=5. O is 3 from N(5): O=2(taken) or O=8(taken). Invalid.
Back to K=3: 10 positions. M=1, N=4, Q=5, P=7, S=9. O: 3 apart from N=4: O=1(M) or 7(P). Need to reconsider. Perhaps the "only three persons between" means 3 people between, so |O−N|=4. O at 8 or 0. O=8. L not next to S(9) or M(1): L≠8,10,2. L can be 3,6. Remaining: positions 3,6,8,10 for K,L,O,R,T minus K=3. L=6, O=8. Positions 10 for R and T. T=10, R=? But we have positions: 1=M, 2=?, 3=K, 4=N, 5=Q, 6=L, 7=P, 8=O, 9=S, 10=T. R=2. Who sits right of R(2)? K at position 3.