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Programming Enigma Puzzles
From New Scientist #959, 24th July 1975 [link]
On the Mount of Mystery dwell those ostraglobulous giants Og, Gog and Magog. They can smell the blood of any Englishman within 400 leagues. So they spotted John Bull as soon as he came within range. But they let him get as far as the bar at the Pig and Whistle, while they finished their elevenses.
Then away they went. Og strode off in his five league boots, Gog in his six league boots and Magog in his seven league boots. Progress was speedy and John got a shock when he chanced to look though the bottom of his mug ten minutes later. Og was a mere nine leagues away, Gog a mere seven and Magog a mere ten.
Without going into gory details, can you say how far it is from the Mount to the Pig and Whistle?