I thought this might be easier to answer and show the work using a pic
When a line is given in the form

The slope of the line is m. So, in this case, the slope of
is 1.
Given a slope
, you find the slope of a perpendicular line
by imposing

So, if the given line has slope 1, a perpendicular line has slope
given by

and thus 
So, we want a line with slope -1 and passing through (12,-1). Using the fomula

we get

Divide 360 by 24 to find 1%. Then multiply by 100. 360/24 *100= 1500
Answer:
65 miles
Step-by-step explanation:
distance over time
325/5 = 65