i need help on the ones i got wrong

The bathtub theory of operations management is being promoted as the next breakthrough for global competitiveness. The factory is a bathtub with 50 gallons of capacity. The drain is the outlet to the market and can output three gallons per hour when wide open. The faucet is the raw material input and can let material in at a rate of four gallons per hour. Now, to test your comprehension of the intricacles of operations (assume the bathtub is empty to begin with): 0.1. What is the maximum rate (gallons per hout) at which the market can be served if all valves are set to maximum? a-2. If the faucet is running at maximum and the drain is wide open, in how many hours will the bathtub completely fill and start to overllow? Answer is complete and correct. b. Suppose that, instead of a faucet, a five-gallon container is used for filling the bathtub fassume a full container is next to the tub to begin with): it takes two hours to refill the centainer and return it to the bathtub. What is the average output rate (gallons per hour)? (Round your answer to 1 decimal place.) Answer is complete but not entirely correct