Boat and aircraft speed is measured in Knots. Both mph and knots is a measurement of distance that is traveled over a certain period of time. 1 knot = 6076 feet per hour or 1 nautical mile per hour 1 mph = 5280 feet per hour or 1 mile per hour
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49 knots=56.388193 miles per hour
11 knots=12.6585739 miles per hour
40 knots=46.0311779 miles per hour
439 knots=505.192178 miles per hour
36 knots=41.4280601 miles per hour