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'Weekly Problem 31 - 2010' printed from http://nrich.maths.org/

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Driving to Birmingham airport, Mary cruised at 55 miles per hour for the first two hours and then flew along at 70 miles per hour for the remainder of the jorney. Her average speed for the entire journey was 60 miles per hour. How long did Mary's journey to Birmingham Airport take?

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This problem is taken from the UKMT Mathematical Challenges.

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