Final answer:
To determine the time it takes for the water level to drop, calculate the initial volume, establish the rate of water loss, and solve the equation to find the time.
Explanation:
To find the time it takes for the water level to fall by 20 cm:
- First, calculate the volume of water in the tank initially.
- Then, determine the rate of water loss per hour and set up an equation to find the time taken for the water level to drop by 20 cm.
- Solve the equation to find the time it will take for the water level to decrease by 20 cm.
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