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Mathematics 18 Online
OpenStudy (coconutjj):

What is 01:05AM - 2:06

OpenStudy (shadowlegendx):

What do you think it is?

OpenStudy (jtvatsim):

What have you tried so far? Any guesses?

OpenStudy (ahsome):

10:59PM

OpenStudy (shadowlegendx):

So they are trying to see if you can subtract with time?

OpenStudy (ahsome):

That is what I think he means

OpenStudy (shadowlegendx):

Well, what are the optional choices? If there are any

OpenStudy (ahsome):

The difference between 01:05AM and 2:06AM/PM? I don't know. This is my best guess on the question

OpenStudy (coconutjj):

1:05AM - 2hrs and 6min

OpenStudy (ahsome):

That will be 10:59PM

OpenStudy (shadowlegendx):

the difference is a mathematical term for subtraction

OpenStudy (shadowlegendx):

So yes we are subtracting time here

OpenStudy (shadowlegendx):

We have a starting time of 1:05am and we need to go back 2hrs and 6 minutes

OpenStudy (coconutjj):

Can you show me how to do it with "paper and pencil"

OpenStudy (ahsome):

Ok. Lets do the hours first \[1:05AM - 2\] is 11:05AM

OpenStudy (ahsome):

Then you take away 6 \[11:05PM-00:06\] \[10:59PM\]

OpenStudy (shadowlegendx):

|dw:1410061713215:dw|

OpenStudy (ahsome):

Nice drawing ;)

OpenStudy (coconutjj):

hmm it works for easier ones... but what about when you get into 24 hour time and you have seconds.

OpenStudy (shadowlegendx):

@Ahsome is correct, but I wanted to show a graphic drawing as the "question asker" needs to know how to write this down on paper.

OpenStudy (shadowlegendx):

In graphing terms

OpenStudy (shadowlegendx):

So @CoconutJJ when you want to solve this problem you should just draw a clock

OpenStudy (shadowlegendx):

1am 5pm 6pm all the times.

OpenStudy (coconutjj):

problem with that is when the number of hours is greater than 24

OpenStudy (ahsome):

Can you give example?

OpenStudy (shadowlegendx):

Remember that 24hrs is 1 full day. So say you had 5pm - 24hrs You would just go back a FULL DAY and go to 5pm yesterday

OpenStudy (coconutjj):

yea but what about this 23:09:56PM - 78hrs:53min:23secs

OpenStudy (shadowlegendx):

23:09:56PM - 78hrs:53min:23secs So our starting time is 23hours: 09minutes: 56seconds we must subtract 78hrs: 53minutes:23seconds from our starting time Note: 78hrs is 3days and 6hrs

OpenStudy (shadowlegendx):

So lets start with the seconds What 56 - 23?

OpenStudy (coconutjj):

I'm in search of some algorithmic way. like normal "vertical" subtract

OpenStudy (coconutjj):

33

OpenStudy (shadowlegendx):

33 is our seconds now lets move on to minutes 09minutes minus 53minutes Now we cannot subtract 53minutes from 09minutes. We must borrow 1hour from 23. 23-1 = 22 1:09minutes - 53minutes = ?

OpenStudy (coconutjj):

16min

OpenStudy (shadowlegendx):

Sorry I disappeared So now we have 22hrs 16min and 33seconds

OpenStudy (shadowlegendx):

We need to subtract 78hrs from 22hrs

OpenStudy (shadowlegendx):

This is sort of weird as you are basically subtracting 3FULL days which will bring it right back to 22hrs. Just 3 days back. But then we will also have to subtract 6hrs from 22hrs What is 22 - 6 ?

OpenStudy (shadowlegendx):

It seems that you might be afk so I will answer this for you. 22 - 6 = 16

OpenStudy (shadowlegendx):

Our final answer is 16hrs 16min and 33 seconds

OpenStudy (shadowlegendx):

16hrs 16min 33seconds Remember this is 3days 6hrs 53min and 23seconds back from the starting point of 23hrs 09min and 56seconds

OpenStudy (shadowlegendx):

If you have any more questions just let me know :)

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