Concept explainers
To determine the speed at which Elizabeth should drive to get an average of 45 mi/hr.
Answer to Problem 16P
The speed at which Elizabeth should drive shall be 60 mi/hr.
Explanation of Solution
Given information :
Elizabeth drove the first half of a trip at
Average speed is 45 mi/hr.
Let the speed of Elizabeth for second half be
Hence the time for first half shall be
Time for second half shall be
Hence the average becomes,
Hence the speed at which Elizabeth should drive shall be 60 mi/hr.
Chapter 5 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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