25 cm*25cm*1cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions.It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m*1m*1cm flat sheet of same materials is to be dried from one side only.Under the same constant drying conditions, the time required for drying( in seconds) from its initial weight of 19.2 kg to 17.6 kg.