Period ( left swing + right swing) of a simple pendulum = 2*pi * sqrt (L/g) in seconds.
g = 32.2 feet per second2
L = 32 inches = 2.66667 feet
Period = 2*pi * sqrt ( 2.66667ft/32.2) = 2*pi * 0.287777 = 1.808158 seconds for one period (two swings).
Periods in one minute = 60 sec / 1.808158 sec = 33.183 periods in one minute.
Times 2 = 66.366 swings in one minute.
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The circumference of an 18 inch diameter wheel is 3.14159 times 18 inches, or about 4.712 feet. 80 miles per hour is 80 times 5280 divided by 60, or about 7040 feet per minute. Divide 7040 by 4.712 and you get about 1494 revolutions per minute.
One foot is 12 times as large as 1 inch, or 11 times larger.
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.)
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An inch is about 25 times larger than a millimeter.