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1 1 1
----- + ------- = ------
13/20 4/15 T
resolviendo
20 15 1
------- + -------- = -------
13 4 T
80 + 195 = 42 / T
275 = 42 /T
despejando T
T = 42/275 = 0.15 de hora
convirtiendo a minutos 0.15 * 60 = 9 minutos
ambos demoran 42/275 de hora ó 0.15 hora