# If the time is 4:30, what time was it 19 hours ago?

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• Make it easier.

Don't work back 19 hours

Work foward 5 hours

because 24 - 19 = 5

4:30 becomes 9:30

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• Our hours are base 24, so -19 is the same as add 5

4:30 -19 = 4:30 + 5 = 9:30

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• Time 19 hours ago was 9 : 30

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• 4:30 + 24 =

28:30

28:30 - 19 =

9:30

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• Wow, I am getting slow in my days, took nearly 6 seconds to work this in my head.

The time would have been 9:30 in the opposite meridian.

14:30 in 24 hour format.

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• 24 hours ago = 4:30 am or pm

19 hours ago = 9:30 am or pm

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• 19 hours before 4:30.

Let's add 24 hours to 4:30, then subtract 19 from it:

28:30 - 19:00 = 9:30

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• 30 minutes is one half of an hour. Let’s subtract these two numbers.

t = 19 – 4.5 = 14.5 hours

One day is 24 hours.

24 – 14.5 = 9.5

The time is 9:30 on the next day.

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• 9:30 (I think that is correct)

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• Anonymous
9 months ago

Wow. I didn't realize math was that hard. 9:30.

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