GMAT Practice Question Set #14 (Question 40-42)

Problem Solving Question #42: Average Car Speed  
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A car has been driven with an average speed of 30 kilometers per hour during the first 30
kilometers of a journey. Upon reaching the 30th kilometer, the car then travels at 45 kilometers per
hour for the next 30 kilometers. Find out the average speed of the car if it has not been stopped at
all during the journey.











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