Two different taxi companies, Company A and Company B, charge a base fare plus a per-mile rate. The total cost for Company A for miles is given by . The total cost for Company B for miles is given by . Which of the following statements is true regarding the per-mile rates of the two companies?
Company A's per-mile rate is higher than Company B's.
Company B's per-mile rate is higher than Company A's.
Both companies have the same per-mile rate.
The per-mile rates cannot be determined from the given information.
