One hour is 60 minutes so one and a half hour is 60 + 30=90 minutes
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30 minutes = half an hour, because 60 minutes are one hour.
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour
2.5 minutes
There are thirty minutes in one half hour.
One-hundred-and-fifty minutes is equivalent to two-and-a-half hours.