Air flows in a 5 cm by 8 cm cross section rectangular duct at a velocity of

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Air flows in a 5 cm by 8 cm cross section rectangular duct at a velocity of 4 m/s at 1 atm and 15°C. The Reynolds number for this flow is

(a) 13,605 

(b) 16,745 

(c) 17,690 

(d) 21,770

(e) 23,235

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