Answer:
If we divide the pool into two parts, the upper part is a regular cuboid shape with dimensions 25m, 50m and 1 meters.
Volume of the upper cubiod = 25 x 50 x 1 = 1250 m³
Volume of the lower cubiod = 25 x 50 x 3 = 3750 m³
As the pool is involving only half of the volume of the lower cuboid, this volume will be 3750 ÷ 2 = 1875 m³
Hence, volume of the swimming pool = 1250 + 1875 = 3125 m³