Half past two
or
Two thirty.
or
2:30
Very formally ' Two hours of the clock (o'clock), and thirty minutes).
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1:15 (one-fifteen) is quarter past one since it is one-quarter of an hour after one o'clock.
One hour is 60 minutes so one and a half hour is 60 + 30=90 minutes
You can write it 2 ways in 12 hour ime and in 24 hour time 12 hour: 01:01 pm 24 hour: 1301
15 min.
12 hour