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1/4
=2/4 de hora
estudia matematica:
60 min * (3/8) = 180/8 = 90/4 = 45/2 = 22,5 min
estudia comunicacion:
60 min* 1/4 = 60/4 = 30/2 = 15 min
22,5 + 15 = 37,5
que equivale a 37 minutos y 30 segundos