Concept explainers
To write the expression for time spent on running up and down the hill by the runner.
Answer to Problem 4LC
Explanation of Solution
Given:
The runner practice running 2 mile up given slope and 2 miles down, and speed of the running down is 50% faster than the speed of running up.
Concept Used:
Calculation:
To write the expression for time spent on running up and down the hill by the runner use the formula
First consider the runner’s speed when running up the slope is r miles per hour, and since it is 50% faster that means runner’s speed running down is 50% less than r , mathematically:
Thus, running down speed
Now, expressions for time taken can be written as
Thus expressions representing time taken is
Chapter 11 Solutions
High School Math 2015 Common Core Algebra 1 Student Edition Grade 8/9
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