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Los datos son:
d = 1800
t = 1 min y 30 s
v = ?
Convertimos todo el tiempo a segundos
1 minuto = 60 segundos
60 + 30 = 90 segundos
Calculamos la rapidez
v = d/t
v = 1800 m / 90 s
v = 20 m/s-----------------Respuesta