Sixty-nine of an hour refers to 69 minutes, which is one hour and nine minutes. Since there are 60 minutes in an hour, 69 minutes exceeds the standard hour by 9 minutes.
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About 69 Mph
An hour contains 60 minutes, so 69 minutes would be equal to 1.15 hours.
If you're moving at 69 miles per hour, then you cover 1 mile in each 1/69th of an hour. In order to cover 66 miles, you have to keep this up for 66/69 of an hour = 57min 23sec(rounded)
Dividing distance by time gives 69/55 = 1.254 recurring (that is, 1.2545454..) hours or 1 hour 15 minutes 14.4 seconds.
69 miles per hour = 69*5280 = 364320 feet per hour =364320/60 ft per minute = 6072 feet per minute = 6072/60 ft per sec = 101.2 ft per sec = 101.2*8 ft after 8 sec = 809.6 ft