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Answer:
0 mph
Step-by-step explanation:
The slope of the curve in section B is ...
m = (y2 -y1)/(x2 -x1)
m = (30 mi - 30 mi)/(6 h -4 h) = (0 mi)(2 h) = 0 mi/h
The rate of change in section B is 0 miles per hour.