Around 77 mph or 123 kmph
For future reference you can type into Google "xx knots in mph" or "xx knots in kmph"
4 knots top speed was 8 knots
They believe about 20 Knots
we dont know
Yes, for most cruise ships 23 knots is their top speed. The only other ship that goes faster is the Queen Mary 2 at 28 knots, but that makes weekly transatlantic crossings.
Speed is no longer a design criteria for cruise ships.
Usual cruising speed was around 4 or 5 knots. Top speed was about 8. Remember that the speed varies according to the wind.
34.75 knots
About 9.6 knots.
Fast
20.5 Knots = 23.59097868448262 Miles per Hour Using this conversion tool. http://www.calculateme.com/Speed/Knots/ToMilesperHour.htm There you go.
In knots.
32 knots =34.4