Given : Raina will rent a car for the weekend.
The cost of the first plan : $49 and costs an additional $0.11 per mile driven.
The cost of the second plan: $42 and costs an additional $0.13 per mile driven.
Let the number of the miles driven = m
So, the cost of the first plan = 0.11 m + 49
The cost of the second plan = 0.13 m + 42
For what amount of driving do the two plans cost the same?
So, equating the two costs:

So, the number of miles = 350 miles
what is the cost when the two plans cost the same?
The cost will be = 0.11 * 350 + 49 = $87.5