How many minutes are in an hour and a half?

90 min are in a hour and a half
90
since an hour is 60 minutes and a half hour is half that (30) you just do a simple addition for your answer

60+30=90 minutes
The number of mintues in a half hour are 30 minutes because a full hour is 60 minutes and if you divide it in to 2's u get 30 min!