A fire engine's water tank holds 1000 gallons of water. If the pump removes 300 gallons of water in 3 minutes, what is the change in the amount of water in gallons in 1 minutem

In 1 minute, the pump removes 300 gallons / 3 minutes = <<300/3=100>>100 gallons of water. Answer: \boxed{100}.

To find the change in the amount of water in 1 minute, we need to calculate the amount of water removed per minute.

Given that the pump removes 300 gallons of water in 3 minutes, we can find the amount of water removed in 1 minute by dividing the total amount of water removed by the time taken:
300 gallons / 3 minutes = 100 gallons per minute

Therefore, the change in the amount of water in 1 minute is 100 gallons.