It is 15/120, which can be simplified, if required.
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30 minutes is half an hour (1/2 as a fraction. 0.5 as a decimal). Note, there are 60 minutes in 1 hour.
15 minutes is a whole of 15 minutes. It is all of 15 minutes (100%), 1/4 of an hour (25%), 3/4 of 20 minutes (75%), 1/2 of 30 minutes (50%), 1/96 of a day (1.04167%).
3/2
1\2
1/2 hour