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Los datos que tienes son:
d = 156 m
t = 45 s
v = ?
Calculamos la velocidad
v = d/t
v = 156 m / 45 s
v = 3,47 m/s
Pasas la velocidad a km/h
v = (3,47 m/s) (3600 s) / (1 h) (1 km) / (1000 m) = 12,49 km/h
Respuesta
v = 12,49 km/h