Question: On a 300-mile auto trip, Lisa averaged 52 mph for the first 100 miles, 65 mph for the second 100 miles, and 58 mph for

On a 300-mile auto trip, Lisa averaged 52 mph for the first 100 miles, 65 mph for the second 100 miles, and 58 mph for the last 100 miles.
a. How long did the 300-mile trip take?
b. Could you find Lisa’s average speed for the 300-mile trip by calculating (52 + 65 + 58)/3? If not, find the correct average speed for the trip.

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