The fan drift pressure readings and fan quantities are measured to...

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The fan drift pressure readings and fan quantities are measured to be 500 Pa and 65 m³/s respectively at the time when NVP aids fan pressure. On reversal, the fan delivers a quantity of 50 m³/s while acting against NVP with fan drift pressure of 600 Pa. Assuming that the NVP remains constant in both cases the total resistance of the mine in Ns²/m⁸ will be

A. 0.9487

B. 0.2750

C. 0.4105

D. 0.1635

Answer: Option D

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