Discussion
For the same layer, the time to reach a moisture ratio of \( 0.10 \) is
Answer: B
Correct answer: 9.2 hours
Rearranging \( MR = \exp(-kt) \) for the time:
\[ t = -\frac{\ln MR}{k} = -\frac{\ln 0.10}{0.25} = \frac{2.303}{0.25} = 9.2\ \mathrm{hours} \]
Compare this with the previous item: four hours took the moisture ratio to \( 0.368 \), but reaching \( 0.10 \) takes more than twice as long again. The exponential form means each further reduction costs progressively more time, which is why the last few points of moisture are the most expensive to remove.
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