28.77 mph.
http://wiki.answers.com/Q/How_fast_is_25_knots_in_...

A speed of 25 knots is equal to 28.8 miles per hour. ChaCha again!
http://www.chacha.com/question/howfastis25knot...

The speed of one knot is equal to 1.16 mph. I think a person walking can beat that speed. Heck, a turtle could beat that speed. Maybe the turtle could be the one pulling the ship!
http://answers.ask.com/Reference/Dictionaries/how_...

Twentyfive (25) knots is equivalent to 28.77 mph (miles per hour). One knot is equal to 1.151 mph!
http://www.kgbanswers.com/howfastis25knots/203...
