What is the correct Douma s equation for rectangular tunnels or condui – McqOptions

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1.	What is the correct Douma s equation for rectangular tunnels or conduits?
A.	X<sup>2</sup> + 10.4 Y<sup>2</sup> = d<sup>2</sup>
B.	4X<sup>2</sup> + 10.4 Y<sup>2</sup> = d<sup>2</sup>
C.	4X<sup>2</sup> + 44.4 Y<sup>2</sup> = d<sup>2</sup>
D.	X<sup>2</sup> 10.4 Y<sup>2</sup> = d<sup>2</sup>
Answer» B. 4X<sup>2</sup> + 10.4 Y<sup>2</sup> = d<sup>2</sup>

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