Question

If 1 mile is equal to 1.6 kilometers, convert 50 kilometers to miles.


A. 31.25 miles
B. 48.4 miles
C. 51.6 miles
D. 80 miles

Answer 1

use a proportion so 1/1.6 and x/50 , the answer is a

Answer 2

use a proportion is a good advise, but in the world of science, we use dimensional analysis

\( 50km \times \large \frac{1miles}{1.6km} = something~miles \)
do you see that you used the units of measurements and cancelled them properly then retained the unit needed?