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Scrabble
Errr... I stand to be corrected but:
Its an equivalent gradient of 0.42%:
50,000 metres= 50km (rise)
12,000 km= 12,000km (run)
Gradient = rise/run x 100
For reference-
Regents Park (outer circle) has 30m (though some sources claim 50!) of vertical rise. It is roughly 4.4km long.
So an average gradient of 0.68%