During a 1.5-hour trip

MATHEMATICS · Subjective · AP · Calculus AB · Analytical Applications of Differentiation · Analytical Applications of Differentiation

Problem

During a 1.5-hour trip, a car traveled 120 miles on a highway where the legal speed limit is 70 mi/h. Must it be true that the car’s speedometer read more than 70 mi/h at some instant during the trip? Answer Yes or No and give a one-sentence reason.

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