Tim goes in a car journey. for the first 15 minutes his average speed is 40mph. he then stops for 25 minutes. he then completes the journey at an average speed of 45mph. the total journey time is 1 hour.

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Tim goes in a car journey. for the first 15 minutes his average speed is 40mph. he then stops for 25 minutes. he then completes the journey at an average speed of 45mph. the tot…

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