We have the following parameter
Company A
The charges is given by
Company B
The charges is given by
To determine how many miles it will take for the rental cost of company A to exceed B, we will set up the inequality
To find the number of miles, we will make x the subject of the formula
Re-arranging
Therefore, for the rental cost of company A to be better than company B, the number of miles driven in a day must be greater than 600 miles