The answer is 40 miles.
First you have to put it into an equation. When you do this you get .90x+2+3.50=41.50
Now you have to solve using inverse operation. Subtract 3.50 from 41.50 and you get 38.00. Now your equation is .90x+2=38.00
Now you have to subtract 2 form 38.00 and you get 36.00. Now you get .90x=36.00
Then you have to divide 36.00 by .90 and you get 40. Therefore x=40, which means you can travel 40 miles.