Question 61433
Let x=the number of miles they would have to drive before the Toyota price is 
more than the Avis price.

Assumption:  They can only rent from Toyota by the week - not by the day.
Thus, Avis would cost $245 for the same amount of time (7 days).

Now we know that when the cost of Toyota per week (minimum rental) (150+.19x) equals the cost of Avis per week ($245), any additional mileage would make the Toyota price more than the Avis price.  Thus, our equation to solve is:

(150+.19x)=245 and
.19x=245-150
.19x=95
x=500 miles 

Hope this helps--------------ptaylor