1 and a half. There are one and a half minutes in one and a half minutes.
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there are 90 secs in 1 and 1/2 minutes
There are 60 minutes in 1 hour so there are 60 x 5.5 minutes in five and a half hours, which is 330 minutes.
90
There are 150 minutes in 2+1/2 hours; there are 60 minutes per hour.
1 hour = 60 minutes → 4½ hours = 4.5 × 60 minutes = 270 minutes