This can't be serious, can it?
half hour=0,5 hours.
1/0,5=2
so 2 half hours equal 1 hour.
But remember time is always relative and can be changed using energy, I recommend you read Einstein's relatively theory
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30 minutes equal half an hour.
30 minutes = half an hour, because 60 minutes are one hour.
90
Ninety minutes are in an hour and a half
There are 30 minutes in half an hour and 15 minutes in a quarter of an hour