Mathematics · Speed, Time and Distance
A man's average driving speed for a total journey of 9 hours is 72 km/h. During the first 3 hours, he drove at 54 km/h; for the next 2 hours and 15 minutes, he drove at 68 km/h; and he maintained a speed of 90 km/h for another 3 hours. What was his driving speed (in km/h) for the last 45 minutes of the journey?
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