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20 minutos equivale a 20/60 que es igual a 1/3 de una hora
12 minutos equivale a 12/60 que es igual a 1/5 de una hora
60/20=3
20 minutos: 1/3 , 2/6 , 4/12 ,20/60
60/12=5
12 minutos: 1/5,2/10,4/20,12/60