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A fan is used to cool down a room with volume of 720 m3. If air in the house is to be exchanged once every

A fan is used to cool down a room with volume of 720 m3. If air in the house is to be exchanged once every 20 minutes, determine the average discharge speed of air if the fan diameter is 0.5 m. Assume air is incompressible. Express you answer in m/s.

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