A Plane Begins Its Takeoff at 2:00 P

Multiple Choice

A plane begins its takeoff at 2:00 P.M. on a 3400-mile flight. After 7.5 hours, the plane arrives at its destination. Explain why there are at least two times during the flight when the speed of the plane is 400 miles per hour. ​

A) By the Mean Value Theorem, there is a time when the speed of the plane must equal the average speed of 716 mi/hr. The speed was 400 mi/hr when the plane was accelerating to 716 mi/hr and decelerating from 716 mi/hr.
B) By the Mean Value Theorem, there is a time when the speed of the plane must equal the average speed of 358 mi/hr. The speed was 400 mi/hr when the plane was accelerating to 358 mi/hr and decelerating from 358 mi/hr.
C) By the Mean Value Theorem, there is a time when the speed of the plane must equal the average speed of 227 mi/hr. The speed was 400 mi/hr when the plane was accelerating to 227 mi/hr and decelerating from 227 mi/hr.
D) By the Mean Value Theorem, there is a time when the speed of the plane must equal the average speed of 302 mi/hr. The speed was 400 mi/hr when the plane was accelerating to 302 mi/hr and decelerating from 302 mi/hr.
E) By the Mean Value Theorem, there is a time when the speed of the plane must equal the average speed of 453 mi/hr. The speed was 400 mi/hr when the plane was accelerating to 453 mi/hr and decelerating from 453 mi/hr.