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.------ x -------------- x ------------- =
...(1h)........(1km)......(3600seg)
simplificas km y h
te kedaria
1000m/ 3600s y eso es = 5/18
multiplicas
______________
72*5/18 = 20m/s
y 1 hora = 3600 s
Entonces 72 km/h = (72 x 1000 )/ 3600 = 20 m/ s