
Concept explainers
To find: The length of time John and Mary drove.

Answer to Problem 71E
The John drives 2.25 hours and Mary drives 2.5 hours.
Explanation of Solution
Given:
John drives 60 miles/hour and travels 35 miles more than Mary.
Mary drives 40 miles/hour and takes 15 minutes more than John.
Calculation:
Let the length of time taken by John be x and Mary be y.
According to the given statement, a system of equations is,
Use substitution method to find the values of x and y.
Substitute
Simplify the above equation.
The value of y is 2.5.
Back – substitute 2.5 for y in equation (2) and find value of x.
The value of x is 2.25.
Thus, the John drives 2.25 hours and Mary drives 2.5 hours.
Chapter 10 Solutions
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