To determine the change in the amount of water in gallons in 1 minute, we can start by finding out how much water the pump removes in 1 minute.
The pump removes 250 gallons of water in 5 minutes. To find the rate of water removal per minute, divide 250 gallons by 5 minutes:
\[ \text{Rate of removal} = \frac{250 \text{ gallons}}{5 \text{ minutes}} = 50 \text{ gallons per minute} \]
Since the pump is removing water, the change in the amount of water per minute is negative. Therefore, the change in the amount of water in 1 minute is:
\[ -50 \text{ gallons} \]
So, the correct response is:
−50