I would go with option C. x, in the first equation.
The X term has a coefficient of 3, the lowest common factor amongst the 3 terms making for easy isolation of the variable.
Answer:
6.666666666666... minutes per mile
I believe The answer is B 40
7 because 7 • 7 = 49 • 7 = 343
7.030124314 they all just have to be less then 5
