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1. The problem statement, all variables and given/known data

There is a vertical cylinder-shaped reservoir full of water:

Height h = 18 meters

Radius R = 2 meters

If suddenly a hole appeared on the bottom (radius r = 0.25 meters) how long would it take to empty the reservoir?

2. Relevant equations

Probably related to Bernoulli's principle somehow someway.

3. The attempt at a solution

To be honest with you I just reposted this problem from elsewhere. Some girl tried to solve it and since I am a pure mathematician I pretty much do not have a clue about those things. Tried to google it, but without proper knowledge did not succeed.

Some kind of powerful formula and basic steps would be appreciated.

Thanks.

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# Water flow duration

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