Your question answers itself. There are 2.5 minutes in 2.5 minutes (unless these are minutes in different relative states or on different planets based on that planet's solar day). If you meant to say "How many minutes are there in 2.5 Hours, the answer is 150 minutes (2.5*60=150).
Two half-hours.
150 seconds.
90 minutes two 45 minute half with a 15 minute break
There are 10,5 minutes or 10 minutes and 30 seconds in 10 and a half minutes.
There are exactly 4.5 minutes in 4 and a half minutes? Fascinating huh?
2.5 minutes or two and a half minutes.
Two and a half laps
There are 5 half hours in 150 minutes.
30 minutes.
720 minutes.
210 minutes
1,350 minutes.