3520 feet.
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68 mph = 5,984 feet per minute.
1 mile = 5280 feet, hence 60 miles is 60x5280 = 316800 feet and this is traveled in 1 hour or 60 minutes. Hence per minute is 316800/60 = 5280 feet per minute. There is a short cut. If you multiply miles/hour by 88, you will get feet per minute. Similarly, to get feet per second from miles per hour, multiply mph by the fraction (22/15)
'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.
How far does a car traveling at 25 mph go in 1 second25 miles / hour = 25 x 5,280 feet per hour = 132,000 feet per hour132,000 / 60 minutes per hour = 2200 feet per minute2,200 feet / 60 seconds per minute = 36.66 feet per second
13.636 miles per hour. 100 feet in 5 seconds = 1200 feet in 60 seconds (1 minute) 1200 feet in 1 minute = 7200 feet in 60 minutes (1 hour) 5280 feet in one mile. Therefore, 7200 feet divided by 5280 feet = 13.636 miles here hour