Convert from dekameter to mark twain

Unit Definition (dekameter)
The dekameter or decameter is a common metric unit of distance equal to 10 meters (about 32.8084 feet).

Unit Definition (mark twain)
The mark twain or twain is an old word for the number two, derived from the Anglo-Saxon twegen. The American author Samuel Clemens (1835-1910), who had been a riverboat pilot on the Mississippi in his youth, took his literary name from a traditional riverboat phrase "mark twain", meaning "exactly two" fathoms of water. This was the minimum depth needed for the boats to operate safely without running aground.