Time zone math question

einstein

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Sep 14, 2010
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I was flying from London to Sydney with no stop-overs. I left London at 2:20 p.m. Tuesday (London time) and arrived in Sydney at 6:40 p.m. Wednesday (Syndey time). How long was the flight if Sydney is 11 hours ahead of London?

The answer i get is 17 hours, but the answer book says 17 hours 20 minutes.

If you get 17 hours 20 minutes please show the solution.
 
einstein said:

einstein, I didn't see that as being helpful either.

einstein, let me be a Devil's advocate in the following sentences.

Why isn't it 4 hours 20 minutes from subtracting the time? And then
add 11 hours to 4 hours 20 minutes to get 15 hours 20 minutes?
 
einstein said:
I was flying from London to Sydney with no stop-overs. I left London at 2:20 p.m. Tuesday (London time) and arrived in Sydney at 6:40 p.m. Wednesday (Syndey time). How long was the flight if Sydney is 11 hours ahead of London?
The answer i get is 17 hours, but the answer book says 17 hours 20 minutes.
You said you got 17 hours.
Forget the hours for now: x:20 to y:40 HAS TO mean a difference of something PLUS 20 minutes.
IF 17 hours exactly, then arrival in Sydney would be 6:20, not 6:40

By the way, I see you already got an answer here:
http://www.mathhelpforum.com/math-help/ ... 61403.html
 
lookagain said:
einstein, I didn't see that as being helpful either.
Why isn't it 4 hours 20 minutes drom subtracting the time? And then
add 11 hours to 4 hours 20 minutes to get 15 hours 20 minutes?
Hmmm....WHY is THAT helpful?
 
Denis said:
lookagain said:
einstein, I didn't see that as being helpful either.
Why isn't it 4 hours 20 minutes drom subtracting the time? And then
add 11 hours to 4 hours 20 minutes to get 15 hours 20 minutes?
Hmmm....WHY is THAT helpful?

You left out the quote that I was being a Devil's advocate.
But I (personally) don't necessarily advocate what the Devil advocates.

Here is another point of view:

When the person left London at 2:20 p.m., at that same moment, it was 1:20 a.m.
in Sydney, because it is 11 hours later. However, because the person arrived in
Sydney at 6:40 p.m. its time (which is 18:40 military time), then the duration of
the flight was 18:40 - 1:20 = 17:20 (which represents 17 hours 20 minutes.)
 
lookagain said:
Denis said:
lookagain said:
einstein, I didn't see that as being helpful either.
Why isn't it 4 hours 20 minutes drom subtracting the time? And then
add 11 hours to 4 hours 20 minutes to get 15 hours 20 minutes?
Hmmm....WHY is THAT helpful?

You left out the quote that I was being a Devil's advocate.
But I (personally) don't necessarily advocate what the Devil advocates.

Here is another point of view:

When the person left London at 2:20 p.m., at that same moment, it was 1:20 a.m.
in Sydney, because it is 11 hours later. However, because the person arrived in
Sydney at 6:40 p.m. its time (which is 18:40 military time), then the duration of
the flight was 18:40 - 1:20 = 17:20 (which represents 17 hours 20 minutes.)

First, you said 15 hours 20 minutes (that's wrong, which is why I said: WHY is THAT helpful);
Now you're saying 17 hours 20 minutes (good boy, you're correct!).

Clearer this way:
If no time difference: 2:20pm (day1) to 6:40pm (day2) = 28 hours 20 minutes
Subtract time difference: 28hours 20minutes - 11hours 0minutes = 17hours 20minutes
Could you draw a rectangular box around my "17hours 20minutes"? Thank you.
 
Denis said:
First, you said 15 hours 20 minutes (that's wrong, which is why I said: WHY is THAT helpful);
Now you're saying 17 hours 20 minutes (good boy, you're correct!).

Clearer this way:
If no time difference: 2:20pm (day1) to 6:40pm (day2) = 28 hours 20 minutes
Subtract time difference: 28hours 20minutes - 11hours 0minutes = 17hours 20minutes
Could you draw a rectangular box around my "17hours 20minutes"? Thank you.

You have been reported to the administration for continuing personal attacks and continuing
to be disrespectful.
 
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