Two rental car companies are running specials this month. At Ruben's Rentals, customers will pay $40 to rent a mid-sized car for the first day, plus $4 for each additional day. At Yardley Rent-a-Car, the price for a mid-sized car is $60 for the first day and $2 for every additional day beyond that. At some point, renting from either one of the companies would cost a customer the same amount. How much would the customer pay?