Convert from block [Midwest U.S.] to league [UK nautical]

Unit Definition (block [Midwest U.S.])
The Block is an informal unit of distance popular in the U.S. A block is the average distance between street intersections in the rectangular street grids common in most American cities. The length of a block in many midwestern USA cities is about 1/16 mile or 100 meters.

Unit Definition (league [UK nautical])
League is a unit of distance long common in Europe and Latin America, although no longer an official unit in any nation.