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Calculating average speed on a commute to and from work

Marcus du Sautoy presents a problem about his imagined commute to work. He can travel 10mph on the way there, and 15mph on the way back. The distance is fixed, so the question is, what is his average speed over the whole journey? Panellists on his puzzle game work towards the solution - which is not simply the mean of the two numbers. Du Sautoy presents the solution, using speed = distance / time.

3 minutes

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Mind Games14/02/2005

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