I'm assuming its 175, 336 and 750 minutes?
175 minutes:
175 divided by 60
= 2 remainder 55
= 2 hours and 55 minutes
336 minutes:
336 divided by 60
= 5 remainder 36
= 5 hours and 36 minutes
750 minutes:
750 divided by 60
= 12 remainder 30
= 12 hours and 30 minutes
