(125 ft/sec) x (1 mi / 5280 ft) x (3600 sec / 1 hr) = (125 x 3600 / 5280) (ft - mi - sec / sec - ft - hr) =
85.227 mph (rounded)
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125 x 3600/5280 just over 85 mph
Well, 125 cm is about 49.2 inches, since an inch is about 2.54 cm, which is about 4.1 feet. Now there are 5,280 feet in a mile, and 3,600 seconds in an hour, so a foot per second is 3600 feet per hour which is 3600/5280 mile per hour, which works out to 15/22 mile per hour. So 125 cm per second is about 4.1 feet per second which is about 66/22 or 3 miles per hour.
15 minutes = 1/4 hour so 125 mph for 1/4 hour = 125/4 miles = 31.25 miles.
4.8 hours
Dividing the distance in miles, 125, by the time in hours, 6.25, gives us 125 / 6.25 = 20 miles per hour.