Question

P, Q, and R are racing on a circular track with a length of 'd' meters. During the race, P finishes 800 meters ahead of Q and 1200 meters ahead of R. Likewise, Q finishes 600 meters ahead of R. The race lasts for 'r' rounds. Based on the given information, which of the following values cannot be 'r', assuming the track length is an integer?

A 18
B 24
C 15
D 30
E 12
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