You don't have "knots per hour". A knot is 1 nautical mile per hour, ie 6080 feet.
This speed is 34 x 6080/5280 ie 39.15 mph Take 1.62 as the conversion factor and you have just under 63.5 kph
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1 knot is defined as exactly 1.852 kilometres per hour. Therefore, 23 knots is equal to 23 x 1.852 = 42.596 kilometres per hour.Converted to miles per hour, and rounded to two decimal places, 42.596 kilometres per hour is equal to 26.47 mlies per hour.
439 knots=505.192178 miles per hour
36 knots=41.4280601 miles per hour
40 knots=46.0311779 miles per hour
657.0950374 miles per hour