Use the conversion ratio 1 kilometer equals about 0.62 miles to solve the following problem. It may help to set up a proportion.

Question

An airplane travels about 900 kilometers per hour. What is the airplane's speed in miles per hour?

1 kilometer
0.62 miles

A
1240

B
899.38

C
1451.6

D
558

Answer 1

To convert the airplane's speed from kilometers per hour to miles per hour, we can use the conversion ratio provided (1 kilometer = 0.62 miles).

We start with the equation:

\[ \text{Speed in miles} = \text{Speed in kilometers} \times \text{Conversion factor} \]

Substituting the values we have:

\[ \text{Speed in miles} = 900 , \text{kilometers} \times 0.62 , \text{miles/kilometer} \]

Now, we perform the multiplication:

\[ \text{Speed in miles} = 900 \times 0.62 = 558 \]

Thus, the airplane's speed in miles per hour is 558 miles per hour.

The correct answer is D) 558.