If Mia spent 1/5 of her day watching TV, her remaining time in a day is 5/5 – 1/5 = 4/5 for other things.
So, the time left is 24 * 4/5 = <<24*4/5=19.2>>19.2 hours
The time spent studying is 19.2 /4 = <<19.2/4=4.8>>4.8 hours.
In minutes, that is 4.8 * 60 = <<4.8*60=288>>288 minutes
#### 288