Review the following average rate problem and then proceed to the task below.
A motorist travels 90 miles at a rate of 20 miles per hour. If he returns the same distance at a rate of 40 miles per hour, what is the average speed for the entire trip, in miles per hour?
Distance 1:
Distance 1 is equivalent to 90 miles, the distance for the first leg of the trip. This value is stated in the question stem. Time 1 is determined by dividing Distance 1 by the rate for that part of the trip:
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