Final answer:
The water level will be 1.5m high.
Step-by-step explanation:
To find the height of the water level, we need to calculate the volume of the water that is poured into the tank. The tank has dimensions of 5m x 4m x 4.5m, which gives a volume of 5m x 4m x 4.5m = 90m³. We are given that 60m² of water is poured, so we can use the formula Volume = Area x Height, where the Area is 60m² and the Volume is 90m³. Rearranging the formula to solve for Height, we get Height = Volume / Area = 90m³ / 60m² = 1.5m. Therefore, the water level will be 1.5m high.