Radio 4 in Four - What would have been the most efficient way to get to Mordor? - ÃÛÑ¿´«Ã½ Sounds

Radio 4 in Four - What would have been the most efficient way to get to Mordor? - ÃÛÑ¿´«Ã½ Sounds
What would have been the most efficient way to get to Mordor?
Tim Harford turns to information in the Lord of the Rings books to figure out the maths.