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A, B and C are running at uniform speeds...

A, B and C are running at uniform speeds in the same direction around a circular track. The track is marked with numbers from 1 to 12, like the dials of a clock. The 12 numbers are uniformly spaced along the track. A overtakes B once at 5 and then the next time again at 9 in the next round. A overtakes C once at 2 and then the next time again at 4 in the next round. The ratio of B's speed to C's speed is:

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