90 of them are.
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1 hour is 60 minutes. 60 minutes + 30 minutes = 90 minutes
There are thirty minutes in one half hour.
1 Hour and 30 MinutesIt is 1 hour 30 mins
30 minutes is 0.5 or 1/2 hour.
one 1 hour = 60 minutes 1/2 hour = 60 x 1/2 = 60/2 = 30 minutes