For a duct of rectangular cross-section with length l and breadth b, the value o

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For a duct of rectangular cross-section with length l and breadth b, the value of d e is

Options:

A . l b / l + b

B . 2 l b

C . 2 l b / l + b

D . 4 l b / l + b

Answer: Option C
Answer: (c).2 l b / l + b

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