Convert from exameter to block [East U.S.]

Unit Definition (exameter)
An exametre (American spelling: exameter, symbol: Em) is a unit of length equal to 1018 metres.

Unit Definition (block [East 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 Eastern USA is about 1/20 mile or 80 meters.