0
Anonymous
It would be 15 hours. The time period designation changes at midnight, so 3 hours after 9 PM is 12:00 AM. 12 PM is 12 hours later.
Wiki User
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21 hours
12pm to 7pm is a span of 7 hours.
3 hours between 12pm and 3pm
21
12 hours.
4to 9pm is how much hours