Question 515498
Lets break this down into parts. The difference between 11m and 6m is:

$11.40 - $6.90 = $4.50

11m - 6m = 5m

$4.50 / 5m = $.90 per mile

From then on it is simple. 

6m - 1m = 5m

5m x $.90 = $4.50

$6.90 - $4.50 = $2.40

There is your answer. The fixed charge for the first mile is $2.40. Just to be sure, lets double check.

11m - 1m = 10m

10m x $.90 = $9.00

$9.00 + $2.40 = $11.40

It works. The fixed charge for the first mile is $2.40.

Hope this helped. All the best,
-mucklef