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5 knots is 5.8 mph. Time = Distance / Speed Time = 20 miles / 5.8 miles per hour = 3.45 hours
1 knot = 1 nautical mile per hour time = distance ÷ speed = 948 nmi ÷ 20 kn = 47.4 hours
time = distance ÷ speed 1 knot = 1 nautical mile per hour time = 12 ÷ 20 = 3/5 hour = 36 minutes