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Mensa Question |
bra1ne
Joined: Jun 11, 2002
Posts: 9
From: Northampton, UK
PM |
At the pub the other day we came across a mensa question thats has caused a huge debate in the pub and know at work with bets flying around. Please read the following and post your answers and reason. I will find out the answer in a Newspaper on friday;
On a journey a car travels one way at 44 mph on the way back it is stuck behind traffic and goes only 29.3333 mph. Whats is the average speed?
Thats is post your answers now! |
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luguff
Joined: Jan 17, 2002
Posts: 68
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What kind of car was it? |
bra1ne
Joined: Jun 11, 2002
Posts: 9
From: Northampton, UK
PM |
The type of car is irrelavent and before anyone asks the distance is the same both ways but the question DID NOT state the actual distance |
snowman
Joined: Jun 13, 2002
Posts: 33
From: uk
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I would say the average speed would be 36.6665 mph. The question only states two trips at 1 hour each way, so 44 add 29.333 divide 2. I think hehe :-D cya
This post was posted from a T68i |
FuricTrax
Joined: Jan 31, 2002
Posts: 261
From: West Midlands, UK
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36 2/3 toooo
[addsig] |
bra1ne
Joined: Jun 11, 2002
Posts: 9
From: Northampton, UK
PM |
It is one journey
One way -----> at 44 mph
the back the same way the same distance <------- 29.3333 mph
So if you want to consider time coming back would take longer as they are travelling slower!! |
Hasse
Joined: Mar 06, 2002
Posts: 35
From: Denmark
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I think I had that questoin on an xam in like 6th grade!!!!
off course u just plus the 2 and divide it by 2!!!!
------------------------>Hasse |
arroyootje
Joined: Feb 01, 2002
Posts: > 500
From: UK-Belgium-Azerbaijan
PM |
Yeah, I'd go with 36.6666 too.... it's pretty logical isn't it?
It doesn't really matter how far the distance was. If you want the average of something, then you just add them all up and divide them by how many you added up.... |
bra1ne
Joined: Jun 11, 2002
Posts: 9
From: Northampton, UK
PM |
Thats what I thought but think of it like this;
If the journey is say 88 miles on the way there (at 44 mph) it would take 2 hours and on the way back (at 29.333 mph) it would take 3 hours.
This makes the total journey 176 miles in 5 hours. The average speed of this is 35.2 mph.
And you can change the time to whatever but the speed always comes back to 35.2 mph
Waddya think!??!
[ This Message was edited by: bra1ne on 2002-07-02 20:54 ] |
kevin81
Joined: Mar 12, 2002
Posts: 390
From: Stockholm, Sweden
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Yeah, I think that your answer is correct, bra1ne! 
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evoke
Joined: Mar 05, 2002
Posts: > 500
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Yes add them and then divide by two to get the avergage speed for the entire journey. This is all you can really do with the info given - ie. no distances or times taken but just the speed either way. Assuming both ways were the same distance! So 36.6665!
bra1ne> you have got a good point though so maybe that could be correct although it doesn't tell you the ditance travelled either way although even though in a mensa question I think this may be a little to complex? But i may well be wrong!
Ed
[addsig] |
arroyootje
Joined: Feb 01, 2002
Posts: > 500
From: UK-Belgium-Azerbaijan
PM |
I think the question has some important information that is missing. In this case I would say both answers are correct....
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Bajie
Joined: May 20, 2002
Posts: 92
From: London
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44mph !!!
Must have been on the M25! |
Pink Lady
Joined: Jun 12, 2002
Posts: 44
From: Manila
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I thnk bra1ne has a point here. @ed:even f u change d distnce to 44miles dat wud take u 1 hr to travel and at 29.333 mph ur travel tym back is 1.5 hrs. Thats a period of 2.5 hrs at a distance of 88 miles- that wud giv us an ave of 35.2 ryt? Anyway dats how i see it. Ü peace..
This post was posted from a T68i |
kevin81
Joined: Mar 12, 2002
Posts: 390
From: Stockholm, Sweden
PM |
@Pink Lady: Ah.. nice, another one that agrees with bra1ne. We are 3 now
Yon delete your posts yourself by go to "Edit".. and then mark "Delete post". But that option disappears after a certain amount of time. Check if you still can do it...
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Posted: 2002-07-02 20:34
