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696 feet per minute
30 yards per second, or 90 feet per second.
1 sq ft per min = 1/9 sq yard per minute = 1/(9*60) sq yards per second = 1/540 sq yards per second or 0.001852 sq yds per sec.
There are 5,280 feet in a mile. So 90 miles per hour is 475,200 feet per hour. (90 x 5280) 475,200 divided by the 60 minutes in the hour comes out to 7920 feet per minute. Dividing 7920 feet per minute by the sixty seconds in a minute comes to 132 feet per second. This is also, if you are interested, 44 yards per second. (132 feet per second divided by three feet in a yard)
'F' (feet / minute) x (1 minute / 60 seconds) = (F / 60) (feet - minute / minute - second) = F/60 ft/sec -- Take the number of feet per minute. -- Divide it by 60. -- The answer is the number of feet per second.