Chapter 2.6, Problem 6STP

For Exercises $1-6,$ choose the correct letter.

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 determine

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 $\frac{1}{0.621371}=\frac{100}{x}$

Solve this equation for x .

Cross multiply , it gives $x=62.1371$ miles

Round the answer to nearest miles, it is 62 miles.