Question
Pierre drove at an average speed of 100 km/h for 2 hours. He then reduced his average speed by 20 km/h and continued for another 6 hours before he reached his destination. Find his average speed for the whole journey.
3 m

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Pierre drove at an average speed of 100 km/h for 2 hours. He then reduced his average speed by 20 km/h and continued for another 6 hours before he reached his destination. Find his average speed for the whole journey.