Alex and May must each paint half of a 1236 m fence. Alex paints at a constant rate of 3 $$\(\mathrm{m} / \mathrm{min}\)$$. May paints at a constant rate of $$\(2 \mathrm{~m} / \mathrm{min}\)$$. If they want to finish painting at the same time, how long after May starts should Alex start?

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