7 of them are.
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There are 390 minutes in 6 hours and 30 minutes.
There are 60 minutes in one hour. 0.5 hours is the same as half an hour, so half of sixty minutes is 30 minutes.
0.50 hours is nothing but half an hour. It will have 30 minutes.
one hour is sixty mins half an hour is 30 so: 2x60+30=150 minutes
There are 60 minutes to one hour, so 6x60=360. Half an hour is 30 minutes, so 360+30=390