5.66 is the answer
....................................................................................
5*4^2-3*4*5=80-60=20
Hope that helps you
Mathspapa a website that will help.
Solution
For this case we can create the following schema
We can use the definition of distance:
x= vt
We can find the relative velocity:

And the distance between both is required to be 2 mi so then we can find the time like this:

Then the answer is:
1 hr
14 kinds of doughnuts
she need to make 8 of each
14 x 8 = 112
She needs to make 112 doughnuts total
She's already cooked 4 dozen
4 x 12 = 48
112-48= 64
She needs to make 64 doughnuts still