To determine the rate at which the water was drained from the tank, we need the actual values from the table. Since the table is not provided, I can't calculate the exact rate. However, the rate can be calculated by examining the change in gallons over the change in time.
The formula for the rate of change (drain rate) is:
\[ \text{Rate} = \frac{\text{Change in gallons}}{\text{Change in time}} \]
Please provide the specific values from the table (initial gallons, gallons left after a certain time, and the time interval), and I can calculate the rate for you.
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