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1) Air at 1 atm and 15C with a mass flow rate at 0.15 kg/s flows through a long rectangular duct 7.5 cm by

1) Air at 1 atm and 15C with a mass flow rate at 0.15 kg/s flows through a long rectangular duct 7.5 cm by 15 cm. A section of the duct is maintained at 120C, and the average air temperature at exit from this section is 65C. Determine the length of the duct.

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