A town’s water tower holds 1 million gallons of water. During the day,
the tower is only 2/5 of its full capacity. The tower will be refilled at night, when water
consumption is low, using a pump that pumps water into the tower at a rate of
2000 gallons of water per minute. How long will it take to bring the tower back to
full capacity? Explain how you got your answer. If the town had a pump that only
filled the tank at 500 gallons per minute, how much longer would it take to fill
the tank?