The correct answer to the question asked is the current is 5-mph, except in the real world of boating in the Weirs channel, you need to consider the different drag coefficient for each boat.
A 16' fishing boat with a 40-hp outboard can weigh 800-lbs, while a 27' cruiser with twin 450-hp inboards can weigh maybe 10,000-lbs. The length, weight, and surface friction work together to determine the drag coefficient, and how each boat is effected by the 5-mph current, plus the hull is effected by the wind, too.
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... down and out, liv'n that Walmart side of the lake!
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