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To catch up to Leif, Cormac needs to cover a distance of 100 meters.
Cormac's speed relative to Leif is 105 meters/minute - 65 meters/minute = <<105-65=40>>40 meters/minute.
Therefore, Cormac will catch up to Leif at a rate of 40 meters/minute.
To find out how soon Cormac will catch up to Leif, we can divide the distance Cormac needs to cover (100 meters) by his rate of catching up (40 meters/minute).
Thus, Cormac will catch up to Leif in 100 meters / 40 meters/minute = <<100/40=2.5>>2.5 minutes. Answer: \boxed{2.5}.