Here, we can start with P, O, S and R to form two cases initially.
1.) R completed the race in 3.5 seconds.
2.) P covered the maximum distance among all.
3.) Only two persons covered the lesser distance than that of O.
4.) Two persons sit between O and S.
5.) One person sits between S and R.
From (2), P must have started and finished at the same point. From (3), O is third person to the left of P.
Case 1: When R sits second to the right of S.
Case 2: When R sits second to the left of S.
6.) N sits immediate left of U, who completed the race in 2 seconds.
7.) M covered 11m more than that of R.
8.) Q covered 8m more than that of T.
9.) M does not cover more distance than T and Q.
From (7), case 2 must be rejected. From (7) and (8), Q sits immediate left of T and M sits immediate right of S.
Case 1 :
10.) P covered 17m more than T.
11.) S took 2 seconds more than O to complete the race.
12.) M sits immediate right of one, who took 8 seconds to complete the race.
13.) Person, who took 4 seconds to complete the race is immediate left of one,
who took 9 seconds to complete the race.
14.) T took one-third of the time taken by Q to complete the race.
From (10), the distance between P and Q is 9m. From (11), O and S took 6 and 8 seconds respectively to complete the race. From (13) and (14), P, Q and T took 4, 9 and 3 seconds respectively.
As, the distance between M and S is not defined, so, we cannot determine the distance between T and R.
So, the correct option is (D) : Cannot be determined