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Los datos del problema son:
v = 72 km/h
t = 20 s
d = ?
Pasas las unidades al SI
v = (72 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 20 m/s
Calculamos distancia
d = v * t
d = 20 m/s * 20 s
d = 400 metros--------------Respuesta