i dont think you can, because they are two distinct measurements.
km is a distance
knots is a speed
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Her gun crew had guts, however, for from her canting bow came a half dozen well-aimed rounds. How they pointed and trained their gun on that tilting platform will long remain a wonder, and their dedication in keeping up the fire until they went under would be a matter of pride to any nation.
O'Kane, Richard. Clear the Bridge!: The War Patrols of the U.S.S. Tang
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