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de la teoria de fisica del MRU , d = v*t
d = 12km
t = 1.5h , podemos calcular la velocidad
v = 12/1.5
v = 8 km/h
piden ahora calcular las horas considerando igual valor de la velocidad
d = v*t , t = d/v
t = 25/8
t = 3,125 h