Answer:
I believe its recurring payment fixed annuity A.P.E.X
ANSWER
x = 1.2226
EXPLANATION
To solve this equation we have to apply the property of the logarithm of the base,

Thus, we can apply the natural logarithm - whose base is e, to both sides of the equation,

Now we apply the property of the logarithm of a power,

In our equation,

Then divide both sides by 4 and solve,

The solution to this equation is x = 1.2226, rounded to four decimal places.
Each mile took 7.5 minutes. So we did this by dividing 30 by 4. Hope this helped you :)