To find out how much water the tank gains per minute, you can divide the total gain in gallons by the number of minutes.
The tank gains 24 gallons in 6 minutes:
\[ \text{Water gained per minute} = \frac{24 \text{ gallons}}{6 \text{ minutes}} = 4 \text{ gallons per minute} \]
If you'd like to know how long it will take to fill the tank from a certain starting level or how long it will take to gain a specific amount of water, please provide additional details!