292. Pressure difference of 400 Pa is available to force 20°C air through a circular sheet-metal

duct 450 mm in diameter and 25 m long. At 20°C, ρ = 1.204 kg/m3

and take friction factor, f =

0.016. Determine the velocity.

A. 27.34 ft/s B. 43.72ft/s

C. 89.68 ft/s D. 86.98 ft/s