Illustrative Mathematics 3.4: Fish Tank Mai is filling her fish tank Water flows into the tank at a constant rate. Complete the table as you answer the questions. time (minutes) water (gallons) 0.5 0.8 1.6 1 4.8 3 40 25. 1. How many gallons of water will be in the fish tank after 3 minutes? Explain your reasoning. 2. How long will it take to fill the tank with 40 gallons of water? Explain your reasoning. 3. What is the proportional relationship represented by this table? 4. What is the constant of proportionality?