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6 feet times 12 inches per foot equals 72 inches.
You can't say 'pressure per square inch. It's just 'pressure', which equals force per square inch. You divide the person's weight by the area of the foot in contact with the stairs to get the answer.
Given that there are 144 square inches per square foot, 100,000 pounds per sqaure foot equals 694.44 pounds per square inch.
It is 7.83 gallons per inch. .785x4x4x1=12.56 cubic feet. 12.56 cubic feet x 7.48 gallons per cubic foot=93.9 gallons per foot 93.9 gallons per foot / 12 inches per foot =7.83 gallons per inch.
There are 12 inches in a foot and 60 seconds in an inch:(5 minutes / 1 foot) * (60 seconds / 1 minute) * (1 foot / 12 inches) = 25 seconds per inch(Notice that the minute and foot units cancel out leaving seconds per inch.)