Question
Sean drove at an average speed of 68 km/h for the first 4 hours of the journey. He then increased his average speed by 24 km/h and drove for another 2 hours until he reached his town. Find his average speed for the whole journey.
3 m

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Sean drove at an average speed of 68 km/h for the first 4 hours of the journey. He then increased his average speed by 24 km/h and drove for another 2 hours until he reached his town. Find his average speed for the whole journey.