Several cars, conveniently numbered 0 to N,
are driving in different lanes on a circular track.
For i between 0 and N-1,
if the driver in car i
looks straight ahead, he always sees car i+1.
If the driver in car N looks directly
at the center of the track, he always sees car 0.
What are the possible values
of (s,k,N) for which this holds true if the speed of car i is:
For example, this will work in case 2 if k=2 and N=6. Each car will
be progressively 60 degrees farther around the track.
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