Nurse Missy has 12*(1/3)=<<12*(1/3)=4>>4 special needs patients.

She has 12-4=<<12-4=8>>8 standard care patients.

Special needs patients take 20% longer to serve, which means serving takes 1.2*5=6 minutes per patient.

To serve dinner to all of her standard care patients, it will take 5*8=<<5*8=40>>40 minutes.

To serve dinner to all of her special needs patients, it will take 6*4=<<6*4=24>>24 minutes.

In total, it will take 40+24=<<40+24=64>>64 minutes to serve dinner to all of her patients.

# Answer

64
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Nurse Missy is attending to the needs of 12 patients in her hospital ward.  Most of her patients require standard care, but one-third of her patients have special dietary requirements, which increases the serving time by 20%.  At dinner time, she brings each patient their meal. It takes 5 minutes to serve each standard care patient.  How long does it take, in minutes, for Missy to serve dinner to all of her patients?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
64
Nurse Missy is attending to the needs of 12 patients in her hospital ward.  Most of her patients require standard care, but one-third of her patients have special dietary requirements, which increases the serving time by 20%.  At dinner time, she brings each patient their meal. It takes 5 minutes to serve each standard care patient.  How long does it take, in minutes, for Missy to serve dinner to all of her patients?
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