Convert from hectometer to span

Unit Definition (hectometer)
A hectometre (American spelling: hectometer, symbol: hm) is a measurement of distance equal to 100 metres. This measure is rarely used and is included mostly for completeness, since usage of the SI prefix hecto is no longer recommended.

Unit Definition (span)
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.