To find: The average speed during the whole trip.
The average speed is 40 mi/h.
Speed during the first half distance = 30 mi/h
Speed during the second half distance = 60 min/h
Let be the time taken for the first half.
Let be the time taken for the second half.
Distance traveled on each half on the trip is d
Therefore, the total distance is 2d.
From the given data the time taken for the first half trip is .
Time taken for the second half trip is .
Thus, the average speed is 40 mi/h.
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