170 times 3600 (secs in an hour) divided by 5280 (feet in a mile) 170 x 3600/5280 = 115.91 mph
There are 5280 feet in one mile. Therefore, 3600 feet is equal to 3600/5280 = 0.681 recurring (that is, 0.6818181...) miles.
5280 ft = 1 mile so, 5.5 ft = 5.5/5280 miles. 3600 seconds = 1 hour so, 1 second = 1/3600 hour 5.5 fps equates to, 5.5/5280 ÷ 1/3600 = 5.5 x 3600 / 5280 = 3.75mph
10,739,520,000
5280 divided in to 4 = 1320
880
660
3600
1.1364
1 mile = 5280 ft, 1 hour = 3600 secs. So 1 mph = 5280/3600 = 1.47 ft/sec. For a ratio you can easily remember, 60 mph = 88 ft/sec
Multiply by 5280 to change miles to feet (1 mile = 5280 feet) and divide by 3600 to change hours to seconds (1 hour = 60 minutes = 3600 seconds).60 mph * 5280 feet / 3600 sec = 88 feet per second
154 x 3600 gives feet per hour, divided by 5280 gives mph 105 mph