Concept explainers
For Exercises
Emmanuel was speaking with a friend from another country. His friend told him that the speed limit on most highways is 100 kilometers per hour in her country. This speed sounded fast to Emmanuel. Approximately what speed is this in miles per hour?
F. 62 mph
G. 65 mph
H. 70 mph
I. 100 mph
To Select: It is being asked to select the right option for converting kilometer per hour to miles per hour.
Answer to Problem 6STP
62mph.
Option ‘F’ is right!
Explanation of Solution
Given information: Speed limit on most highways is 100km per hour.
Calculation:
Let’s convert the 100 km per hour to miles per hour.
The conversion factor is 1km =0.621371 miles.
Let there are ‘ x’ miles in 100km.
So, let’s set up proportional equation as
Solve this equation for x .
Cross multiply , it gives
Round the answer to nearest miles, it is 62 miles.
Chapter 2 Solutions
High School Math 2012 Common-core Algebra 1 Practice And Problem Solvingworkbook Grade 8/9
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