It is 2miles wide.
A = length x width
Plug in the information that you know:
1 1/2 = 3/4w
Get "w" by itself by dividing by 3/4
1 1/2 divided by 3/4 is 2.
Check you answer by plugging it into the formula "area = length x width."
1 1/2 = 3/4 • 2
1 1/2 = 1 1/2
Correct!