Which is a better deal

Question

A truck can be rented from Company A for $60 a day plus $.60 per mile. Company B charges $40 a day plus $.80 per mile to rent the same truck. How many miles must be driven in a day to make the rental cost for Company A a better deal than Company B?

Answer 1

Let x be number of miles driven in a day.

⇒ 60 + 0.6x ≤ 40 + 0.8x

⇒ x ≥ 100