3 min.
20 knots is about 23.02 miles per hour (knots x 1.150779448 = mph).
23.02 miles per hour. A knot is a unit of measure for 1 nautical mile per hour. 1 knot=1.151 MPH. Reference the link below:
20 hours ! 1 knot is 1 nautical mile per hour.
To calculate the time it takes to sail 1 kilometer at a speed of 20 knots, first convert knots to kilometers per hour. Since 1 knot is approximately 1.852 kilometers per hour, 20 knots is about 37.04 kilometers per hour. To find the time, use the formula: time = distance/speed. Thus, it will take about 1.62 minutes to sail 1 kilometer at 20 knots.
time = distance ÷ speed 1 knot = 1 nautical mile per hour time = 12 ÷ 20 = 3/5 hour = 36 minutes
1 knot = 1 nautical mile per hour time = distance ÷ speed = 948 nmi ÷ 20 kn = 47.4 hours
20 mph = about 17.4 knots
1 knot = 1 nautical mile per hour time = distance ÷ speed = 140 nautical miles ÷ 20 nautical miles per hour = 7 hours.
21.81 hours.
15 knots = 15 nautical miles per hour, so 1/3 hour or 20 minutes
One knot is 1.15mph
1 knot is about 1.15 mph 20 knots = 23 mph you may try this online converter next time http://www.rillocenter.com/convert/speed.html