Question
Mark drove a car at an average speed of 99 km/h for 40 minutes. He then reduced his average speed by 9 km/h and drove another 50 min before he reached his destination. Find the total distance covered by Mark.
3 m

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Mark drove a car at an average speed of 99 km/h for 40 minutes. He then reduced his average speed by 9 km/h and drove another 50 min before he reached his destination. Find the total distance covered by Mark.