
Concept explainers
To find: The speeds of woman running and cycling.

Answer to Problem 72E
The woman runs at 5 miles/hour and cycles at 20 miles/hour.
Explanation of Solution
Given:
Woman spends
Woman spends 12 minutes on running and 45 minutes on cycling on Tuesday, covers 16 miles.
Calculation:
Let the woman runs by x speed and cycles by y speed.
According to the given statement, a system of equations is,
Use substitution method to find the values of x and y.
Simplify equation (1) for the value of x.
Substitute
Simplify the above equation.
The value of y is 20.
Back – substitute 20 for y in equation (1) and find value of x.
Simplify the above equation.
The value of x is 5.
Thus, woman runs at 5 miles/hour and cycles at 20 miles/hour.
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