What formula is used to determine fire flow using the mathematical method?
A. Qr = (Qf x hr0.54) ÷ hf0.54
B. Qr = (0.54 x Qf) ÷ hf0.54
C. Qr = (Qf x hr0.68) ÷ hf0.68
D. Qr = (Qf0.74 x hr0.74) ÷ hf0.74
A
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