Question

A taxi service has two rates, as follows: Rate A charges a flat $2.50 for every mile; rate B charges $15 plus $1.50 per mile. At least how many miles (expressed as a whole number) must one travel to make Rate B cheaper?

Answer 1

Rate A: 2.50x
Rate B: 1.50x + 15

2.50x > 1.50x + 15
-1.50x    -1.50x

1.00x > 15
x > 15

You must drive at least 15 miles before Rate B is cheaper