Divde by 60 as there are 60 mins in 1 hour.
300/60 = 5 hours
If the answer had not been a whole number then you need to be careful.
260 mins into hours:
260/60 = 4.3333333 this is not 4 hours 33.333 mins.
4hours = 4 x 60 = 240mins so 260 min = 4hours and 20 mins