The knot is a unit of speed equal to one nautical mile per hour, approximately 1.151 mph. Therefore, 18 knots = 18 x 1.151 = 20.718 mph
172.50 miles per hour. There are approximately 1.151 knots to every mile per hour, so multiply the number of knots by 1.151 to get miles per hour (mph).
207.14 mph
34.75 knots
About 9.6 knots.
130 knots , 150 mph
Fast
For a fairly new helicopter, around 120 knots. Around 150 mph, except for fast military helicopters.
150 kilometers per hour is 81 Knots.
32 knots =34.4
Some fast ferries around the world do over 30 knots.
105 knots is 120.832 mph
22 knots = 25.3171479 mph
17 knots = 19.56 mph
35 knots is 40.2773 mph