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You need to sail 1.12% faster measured in knots. The time you need to go faster is 35 sec per mile. In nautical miles that is 35 x 2025/1760 or 40.3 seconds. As a knot is a nautical mile per hour to convert to hours this is 40.3 x100/60x60 = 1.12%. The speed is irrelevant because you have to increase it by the same percentage. Although others point out that you can make up for a lack of speed by sailing smarter and reducing distance, or time taken, assuming both you and your competitor continue to sail in the same way, to simply answer your question you need to increase speed by 1.12%After an hour at 4 knots a 1% difference is only 90 odd yards to put it in perspective. Chris.
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