Discussion
A tank of volume 300 litres with a flow of 15 litres per minute is flushed. Roughly how long is needed to remove 95 per cent of the original solute?
Answer: D
Removing ninety-five per cent takes about three time constants, and the time constant here is twenty minutes. Three time constants is a useful rule of thumb for any exponential approach. Five of them take the residue below one per cent.
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