# Blog

## Related Rates Problem – Cylinder Drains Water

### As of September 2022, we're using our Forum for comments and discussion of this topic, and for any math questions. We'd love to see you there and help! Please tap to visit our Forum: community.matheno.com

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Anonymous
2 years ago

Honestly, I never know (in any down deep depth of understanding) why I am really doing what I am doing in math, I just know the steps someone said to do but don’t ask my why the \$&@/ it’s done that way ….like at all. Sucks how school speeds through subjects like a bat outta hell and covers topics in a manner that is more shallow than a puddle.

MARWYN ANGELO CASTILLO
3 years ago

I really learn from this site. I also have a problem set which im not really sure with the way i solve it.
The problem is:
An open top cylindrical water tank containing a certain volume of water with its depth and given area of its hole at the bottom of the container. Find the time rate of the cylindrical water tank will be drained.

Matheno
Editor
3 years ago

Thanks, Marwyn! We’re glad to know you’re learning here at Matheno.

We’d be happy to try to help you develop the solution to your problem, but the question as stated doesn’t make sense to us. Is there other information provided, perhaps in an accompanying figure? Please let us know and we’ll do our best to assist!

Debbie Gaydos
4 years ago

The correct answer is -0.9pi ft^3/sec, yes? Even rounded to 1 decimal place, as indicated by the given answer of “-3.0”, it should be -2.8, not -3.0. I think it is very confusing to give an estimate rather than exact result, with no indication of having done so, and the answer given to 1 decimal places but rounded incorrectly, and without the simplified exact result on which the estimate is based, given first.

Matheno
Editor
4 years ago

Hi, Debbie,

You are absolutely correct, and thank you very much for writing to ask us about it. The error was due to some editing that happened a while back, and thanks to your alerting us we’ve now corrected it. We strive to be clear and correct, and certainly not confusing. We apologize for the error there in that last line, and for the time you must have spent trying to make sense of it.

Thank you again for bringing it to our attention. We appreciate it!

Anonymous
5 years ago

cancel that… I forgot to multiply by pi

Anonymous
5 years ago

shouldn’t it be -0.9 ft/sec?

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