Victor prepared 27 kilograms of dough after working 3 hours. How many hours did Victor work if he prepared 36 kilograms of dough? Solve using unit rates.
Victor prepared 27/3 = <<27/3=9>>9 kilograms of dough per hour.
Hence, Victor worked for 36/9 = <<36/9=4>>4 hours. Answer: \boxed{4}.