From the conditions (i) and (iii), the 1st car to reach R cannot be C1 or C2 or C4. So, it has to be C3. So, C3 is the second to start at P, the fourth to reach Q and the first to reach R. The first car to leave P cannot be C1 or C2 or C3. So, it has to be C4. So, C4 is the second to reach R and the third to reach Q.=> C2 is the first to reach Q and C, is the second. Thus we get the following arrangement.
P Q R 1. C4 C2 C3 2. C3 C1 C4 3. C2/C1 C4 C1/C2 4. C1/C2 C3 C2/C1
C1 is the second car to reach Q.
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