Units
speed

speed

Centimeter per Second

cm/sec

1 km per hour = 1000m per hour = 100000cm per hour seconds in an hour 3600 3600/100000 = 0,036 1kmph = 27.7777777778cm/sec * 60 * 60 =100000,00000008 cm per hour seems about right

accessable via:
cm/sec
Centimeter per Second

formulas

kilometer per hour / 0.036

kilometer per hour × 0.036