The production planner for a private label soft drink maker is planning the production of two soft drinks: root beer (R) and sassafras soda (s). There are at most 15 hours per day of production time and 1,500 gallons per day of carbonated water available. A case of root beer requires 3 minutes of time and 5 gallons of water to produce, while a case of sassafras soda requires 2 minutes of time and 5 gallons of water. Profits for the root beer are $6.00 per case, and profits for the sassafras soda are $4.00 per case. The firm's goal is to maximize profits. What is the time constraint