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?

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?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

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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