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Time Speed Table for use of Seconds - speed in knots 8 - 150 9 - 133.3 10 - 120 11 - 109.1 12 - 100 13 - 92.3 14 - 80.7 15 - 80 16 - 75 17 - 70.6 18 - 66.7 19 - 63.2 20 - 60 21 - 57.1 22 - 54.5