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Consider the drying operation shown in the figure below for a solid loading (dry basis) of $50 \text{ kg/m}^{2}$ with a constant drying rate of $5\: \text{kg/m$^{2}$.h.}$ The falling rate of drying is linear with moisture content..

                                                                           

The drying time(in hrs) required to reduce an initial moisture content of $25\%$ to a final moisture content of $2\%$ is

  1. $1.55$
  2. $1.75$
  3. $3.25$
  4. $4.55$
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