How fast is a knots?

A typical go-fast is built of fiberglass, with a deep "V" offshore racing hull from usually 30 to 50 feet (10 to 15 m) long and multiple powerful engines, often with more than 1000 combined horsepower. The boats can travel at speeds over 80 knots (150 km/h) in calm waters, over 50 knots (90 km/h) in choppy waters, and maintain 25 knots (47 km/h) in the average five to seven foot (1.5 to 2 m) Caribbean seas. They are heavy enough to cut through higher waves, although at a slower pace.