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AB = 36 km/h t; para el auto:
AB = 72 km/h (t - 3 h)
Igualamos: 72 (t - 3) = 36 t; simplificamos.
2 (t - 3) = t: por lo tanto t = 6 horas.
Reemplazamos: AB = 36 . 6 = 216 km
Saludos Herminio