Use the conversion ratio 1 kilometer equals about 0.62 miles to solve the following problem. An airplane travels about 900 kilometers per hour. What is the airplane's speed in miles per hour?

Question

a. 899.38
b. 558
c. 1,240
d. 1451.6

Answer 1

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

The airplane travels at 900 kilometers per hour, so we can calculate the speed in miles per hour as follows:

\[ \text{Speed in miles per hour} = \text{Speed in kilometers per hour} \times \text{conversion ratio} \]

\[ \text{Speed in miles per hour} = 900 , \text{km/h} \times 0.62 , \text{miles/km} \]

Now, perform the multiplication:

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

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

The correct answer is b. 558.