Find current value of a variable that depreciates linearly over time

Posted by Hugi on Stack Overflow See other posts from Stack Overflow or by Hugi
Published on 2010-05-27T10:32:16Z Indexed on 2010/05/27 10:41 UTC
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Let's say we have an empty bathtub. We've lost the plug, so once water is added it will drain away at a constant rate of 2 liters pr. minute. We add water to the tub in increments. 60 liters at 10:51, 30 liters at 11:54 and 50 liters at 13:18.

So, the question is: How can I find out how much water is in the bathtub at any given time?

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