A Square Smooth Conduit, 80 Cm on a Side, Circulates $$35 ^ { \circ } \mathrm { C }$$

Multiple Choice

A square smooth conduit, 80 cm on a side, circulates 35 $$35 ^ { \circ } \mathrm { C }$$ C air in a large building. The pressure drop over a 50-m length of the horizontal conduit is not to exceed 800 Pa. Assume an average
Pressure in the conduit of 120 kPa. The maximum flow rate in the conduit is nearest:

A) $37 \mathrm {~m} ^ { 3 } / \mathrm { s }$
B) $29 \mathrm {~m} ^ { 3 } / \mathrm { s }$
C) $18 \mathrm {~m} ^ { 3 } / \mathrm { s }$
D) $11 \mathrm {~m} ^ { 3 } / \mathrm { s }$