Posted by 18ms on Saturday, December 8, 2012 at 1:01am.
(1) There are 7.48 ft^3 in a gallon. Therefore the volume flow rate can be expressed as 75 gallon/min/7.48 gal/ft^3 = 10.03 ft^3/min
Multiply that by the density of water, 62.4 lbm/ft^3, and you get 626 lbm/min.
(lbm stands for pounds mass; the preferred mass unit in the British system is slugs)
(2) Time = Volume/Flow rate
= (pi/4)*D^2*L/10.03 ft^3/min
= 94.0 minutes
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