475 knots = 546.62 mph
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210 knots is 241.6637 miles per hour.
Ships typically travel at 12 to 18 knots, which is nautical miles an hour.
1 knots = 1.15077945 miles per hour, thus:50 x 1.15077945 = 57.5389725 mph
There are 3600 seconds in an hour. Therefore going at 3600 miles per hour is equivalent to 1 miles per second.
About 5.6 miles per hour.