Question
Billy drove a car at an average speed of 72 km/h for 20 minutes. He then reduced his average speed by 20 km/h and drove another 45 min before he reached his destination. Find the total distance covered by Billy.
3 m

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Billy drove a car at an average speed of 72 km/h for 20 minutes. He then reduced his average speed by 20 km/h and drove another 45 min before he reached his destination. Find the total distance covered by Billy.