Finding the time to drain a cylindrical tank

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emzy168
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Homework Statement
Consider the tank drainage problem in the limit of viscosity dominating the fluid flow. The tank starts with 1 m depth of fluid. After 1 minute, the depth is now 0.5 m. What will the fluid depth h be after 2 minutes?
Relevant Equations
Not sure which equation to use for this!! Is it just 0?
Is it just 0? Confused with this question!
 

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Not sure which equation to use for this!
What are the options :smile: ?