9. A driver averages 60 mph (miles per hour) over the first three hours of a trip and 55 mph for the next four hours. If the driver then sets the cruise control to 50 mph, how many additional hours are needed for the average speed of the entire trip to decrease to 54 mph?

An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter2: Motion
Section: Chapter Questions
Problem 6E: A group of college students eager to get to Florida on a spring break drove the 750-mi trip with...
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9. A driver averages 60 mph (miles per hour) over the
first three hours of a trip and 55 mph for the next four
hours. If the driver then sets the cruise control to 50
mph, how many additional hours are needed for the
average speed of the entire trip to decrease to 54 mph?
Transcribed Image Text:9. A driver averages 60 mph (miles per hour) over the first three hours of a trip and 55 mph for the next four hours. If the driver then sets the cruise control to 50 mph, how many additional hours are needed for the average speed of the entire trip to decrease to 54 mph?
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