to make cm to km, divide by 100000. = km/s
to convert from per second to per hour, multiply by 360
overall: *360/100000
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72 (km per hour) = 2,000 cm per second.
Divide by 360,000. 100 for cm to metre and 3600 for hour to sec.
They are the same: 1 cubic cm = 1 mL
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.
Rate = distance / time. Therefore this is 100 / 4 cm per second, or 25 cm per second. This is 0.56 miles per hour; or 0.35 km per hour.