This math problem has got me stumped: 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?
Can you show me the way?