To convert seconds to hours simply divide the number of seconds by 3600.
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cm/sec, yes? ok, divide by 100 to go from cm to m. then multiply by 3600 to go from sec to hr
73.5 km/hour = 73500 meters/hour = 73500/3600 meters/sec = 20.4166 meters/sec
( 1 km/hr ) x (1,000 m/km) x (1/3600 hr/sec) = 5/18 meter/second = 0.2778 meter/second1 meter/sec = 3.6 km/hr
(55 km/hr) x (1,000 m/km) / (3,600 sec/hr) = 15.2777 m/s (rounded, repeating)
(100 m / 9.5 sec) x (1 km / 1,000 m) x (3,600 sec / hr) = (100 x 1 x 3,600) / (9.5 x 1,000) (m - km - sec / sec - m - hr) = 37.895 km/hr