A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 30 minutes. A decimal representation does not imply a change in the measurement units. If this is required then you need to specify the units into which the quantity is to be converted.
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3 hours 30 minutes = 3.5 hours
2.5
It is 1.5 hours
1 minute and 30 seconds is 1.5 minutes.
In relation to one hour it is 0.5 of an hour.