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Palindromic Distance

Problem

Julie is a careful driver and never breaks the speed limit. One day as she set off on a journey in her car she noticed that the odometer was displaying 13931 miles, which was palindromic (the same forwards and backwards). After completing the journey, which took two hours, Julie could not believe that it was palindromic once more.

What was her average speed during the journey?

Problem ID: 267 (11 Feb 2006)     Difficulty: 1 Star

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