A small sample of ground coal is introduced at the top of a column of water $30

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A small sample of ground coal is introduced at the top of a column of water $30 \mathrm{~cm}$ high, and the time required for the particles to settle out is measured. If it takes $26 \mathrm{~s}$ for the first particle to reach the bottom and $18 \mathrm{~h}$ for all particles to settle, what is the range of particle sizes in the sample? $\left(T=60^{\circ} \mathrm{F}, \mathrm{SG}_{\text {coal }}=1.4\right)$

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