30 minutes after 2:54 is 3:24
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1 hour = 60 minutes 2 hours = 2 x 60 = 120 minutes 2 hours and 30 minutes = 120 + 30 = 150 minutes
I believe you are asking how many minutes are in 2 hours and 30 minutes. The answer would be 150 minutes. There are 60 minutes in an hour, so in 2 hours there are 120 minutes, then plus 30 gives you 150.
Angles are measured in degrees, minutes and seconds as for example 660 30' 54''
Note that 1 hour = 60 minutes. Then, 2 hours = 120 minutes. Add that by 30 to obtain 150 minutes, which is the same as 2 hours and 30 minutes.
54 as a percentage of 30 = 100*54/30 = 180%