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TIME TRAVEL

Some years ago the eccentric adventurer Bart Carruthers decided to fly his small plane single-handed around the world. He left London at noon on 1 March, and his route took him via Cairo, Hong Kong, Hawaii, New York and finally across the Atlantic. He arrived back in London at the end of his marathon journey at noon on 31 March. Bart kept no diary and so to keep track of time he simply counted the total number of nights he had over his journey. How many was that?