Each dress takes 4 square meters of fabric to make, so the number of dresses she can make will be 56/4 = <<56/4=14>>14 dresses.

Each dress takes 3 hours to make, thus she will have to work 14 dresses x 3 hours/dress = <<14*3=42>>42 hours.

# Answer

42
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Melissa wants to make some dresses to sell at the upcoming festival. She has 56 square meters of fabric to make them. She knows that each dress takes 4 square meters of fabric and 3 hours to make. How many hours does she have to work?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
42
Melissa wants to make some dresses to sell at the upcoming festival. She has 56 square meters of fabric to make them. She knows that each dress takes 4 square meters of fabric and 3 hours to make. How many hours does she have to work?
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