The train travels 120 miles in 2 hours. How far will the train travel in 4 hours?
So 120/2 and x/4 p.s it can also be written 120/x = 2/4 depending on which way you like to solve proportions.
Cross multiply 4· 120= 480 and 2·X= 2x
Divide 480 by 2 and x= 240
120 miles - 2 hours
x miles - 4 hours
cross multiply:
\(2x=4 \times 120 \\
2x=480 \\
x=\frac{480}{2} \\
x=240\)
It will travel 240 miles.