Convert everything to a common unit (I suggest to convert to hours in this case, but minutes will do, too), then you can subtract.
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2 hours 30 minutes
7 hours and 30 minutes is 7.5 hours.
3 Hours and 30 Minutes=210 minutes=12600 seconds
To convert hours to minutes, you multiply by 60 since there are 60 minutes in an hour. So, 2 hours is equal to 2 x 60 = 120 minutes. Adding 30 minutes to this gives a total of 120 + 30 = 150 minutes. Therefore, 2 hours and 30 minutes is equal to 150 minutes.
It is 2 hours and 30 minutes.