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690 minutes: 60 minutes in 1 hour, times 12 hours

60 times 12 = 720

60 minutes times 12 hours = 720 minutes in 12 hours

720 minutes - 30 minutes = 690 minutes in 11.5 hours

Check your work by dividing 690 minutes over 60 minutes:

690/60 = 11.5 hours

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15y ago

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