Fill a square water tank 40 cm long with water, and then pour the water into a cuboid water tank 80 cm long and 20 cm wide. How deep is the water

Fill a square water tank 40 cm long with water, and then pour the water into a cuboid water tank 80 cm long and 20 cm wide. How deep is the water

The volume of water does not change
Volume of water = 40 × 40 × 40 = 64000 (CC)
Water depth = 64000 ÷ (80 × 20) = 40 (CM)