cm/sec, yes?
ok, divide by 100 to go from cm to m. then multiply by 3600 to go from sec to hr
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( K cm/hr ) x ( 1 meter/100 cm ) x (1 km / 1,000 meters ) x (1 hr / 3,600 sec )= ( K x 1 x 1 x 1 ) / ( 100 x 1,000 x 3,600 ) (cm - m - km - hr) / (hr - cm - m - sec)= K / 360,000,000 km/secTake the number of cm per hour. Divide it by 360 millionto get the number of km per second.
73.5 km/hour = 73500 meters/hour = 73500/3600 meters/sec = 20.4166 meters/sec
( K cm/hr ) x ( 1 meter/100 cm ) x (1 km / 1,000 meters ) x (1 hr / 3,600 sec )= ( K x 1 x 1 x 1 ) / ( 100 x 1,000 x 3,600 ) (cm - m - km - hr) / (hr - cm - m - sec)= K / 360,000,000 km/secTake the number of cm per hour. Divide it by 360 millionto get the number of km per second.
Hr/60 mins/60 sec
(55 km/hr) x (1,000 m/km) / (3,600 sec/hr) = 15.2777 m/s (rounded, repeating)