Fraction of tank drops in every 10 minutes = 1/3 inches.
We need to find the expected change in the tank's water level after 2.25 hours.
Let us convert 2.25 hours in minutes.
1 hours = 60 minutes.
2.25 hours = 2.25 × 60 = 135 minutes.
We need to divide 135 by 10.
We get 13.5.
Now, we need to multiply 1/3 by 13.5, we get.
13.5/3 = 4.5 inches.