(number of miles covered) divided by (number of hours for the trip)
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50 miles per hour.
The car's average speed is 75 miles per hour.
The average speed for the entire trip is 9mph.
5 hours.
During the first hour, they covered (60 x 1) = 60 miles.During the next 2 hours, they covered (45 x 2) = 90 miles.The total distance covered was (60 + 90) = 150 miles.The average rate was (distance/time) = (150/3) = 50 miles per hour.