How many pounds of coffee beans selling for $2.80 per pound should be mixed with 2 pounds of coffee beans selling for $1.60 a pounds to obtain a mixture selling for $2.56 per pound?

A cheap Car Rental company charges $30 per day, plus $0.25 per mile to rent a car, while Easy Car Rental charges $45 per day, 0.10 per mile. If you only need the car for one day, how many miles would you have to drive for the cost to be the same?