An ant is crawling from the left end of a $4 \mathrm{~m}$ long rubber band towards the right end at a constant speed, covering exactly one meter per minute. After each minute, the horizontally placed rubber band, fixed at the left end, is uniformly stretched by one meter. In which minute does the ant reach the right end of the rubber band? The ant is considered point-like, the time taken to stretch the rubber band is negligible, and the rubber band can stretch indefinitely without breaking.