The pool has the shape of a rectangular parallelepiped. its bottom is a square with a side of 4.5 m

The pool has the shape of a rectangular parallelepiped. its bottom is a square with a side of 4.5 m, and the depth of the water in the pool is 1.2 m. How long does it take to pump out this water if the pump capacity is 250 liters per minute?

Let’s determine the volume of water in the pool. To do this, first we find the bottom area:
S = 4.5 * 4.5 = 20.25 (m2).
Then the volume of water is: V = S * h = 20.25 * 1.2 = 24.3 (m3).
Let’s translate the volume into liters: 24.3 m3 = 24300 l.
This means that in order to pump out the water, you will need 24300: 250 = 97.2 (min).