1440.
A half hour is 30 min so there is two half hours in an hour
30 min. in each half
There are 90 minutes in an hour and a half.
There are 60 min in an hr ... SO60 min x 2½ min/hr = 150 min.
90 seconds
A half of an hour is 30 min. and hour and a half is 90 min.
One and a half.
30 minutes ...There are 60 min in an hr, so a half an hr is 60/2 = 30 min.
1440 of them.
1440
2 or 4.5 min.
330mins