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Consider the drying operation shown in the figure below for a solid loading (dry basis) of 50 kg/m$^{2}$ with a constant drying rate of 5 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

- 1.55
- 1.75
- 3.25
- 4.55