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Interview Riddle

 
#1 Interview Riddle
11/11/2009 16:57

The Fiddler

I have a rope that goes around the equator of the earth. How much longer do I need to make the rope in order to raise the distance between the earth and the rope to 1m above the ground at all points?

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#2 RE: Interview Riddle
11/11/2009 17:59

answer to The Fiddler (#1)

Assume that the path around the equator is a perfect circle which has a radius of r meters. Then the length of the rope that goes around the equator is the circumference of this circle which is 2*pi*r meters.

Your aim is to make the rope longer so as to achieve a radius of (r+1) meters. This requires a rope of length 2*pi*(r+1) meters. So you need to add a total of [2*pi*(r+1) - 2*pi*r] = 2*pi meters to the rope, or ~6.28 meters.

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#3 RE: Interview Riddle
11/11/2009 19:14

Evil Consultant to The Fiddler (#1)

You don't actually need to lengthen the rope, depending on what rules you want to assume. You could just move it sideways by 3571.6 metres (although this does mean that you need to know the radius of the Earth and be able to do trigonometry in your head.)

EC

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#4 RE: Interview Riddle
11/11/2009 19:37

anon to The Fiddler (#1)

easy, simple maths

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#5 RE: Interview Riddle
12/11/2009 07:23

Dreamy to anon (#4)

I suspect the question is not designed to see if you can find the right answer, but whether you think in a logical and structured way. So it's not what the correct answer is (although that's nice to have), but your thought process for getting to it.

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#6 RE: Interview Riddle
12/11/2009 11:36

Anon to Dreamy (#5)

Sorry Mr. Client, the warehouse we've designed and built for you is three times bigger than you need, but look!, we thought through it in a logical and structured way.

Also, we know you wanted it in Northampton but we thought about it laterally and you get the same solution if you move it East.

What do you mean, Lowestoft's no where near your customers?

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#7 RE: Interview Riddle
12/11/2009 11:52

Cynic to Anon (#6)

In addition, I can definitively tell you how many golf balls were sold in the USA in 2002 and how many miles of string there are in the world. What do you mean, you've been in this business for 35 years selling mattresses in Huddersfield and already know exactly who your potential customers are?

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#8 RE: Interview Riddle
12/11/2009 12:03

35 years selling mattresses in Huddersfield to Cynic (#7)

Thank you for your solution Mr MC - I'll sleep on it.

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#9 aaa
12/11/2009 22:30

geek to 35 years selling mattresses in Huddersfield (#8)

second poster:

circumference = pi * r squared NOT 2 * pi * r

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#10 RE: aaa
12/11/2009 22:42

mack to geek (#9)

geek the fomula you have provided is to calculate the area, not the circumference.

The post from answer is correct, circumference = pi*d = 2*pi*r.

I guess you fail the interview!

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#11 RE: Interview Riddle
13/11/2009 11:21

Tony Yeboah to Anon (#6)

Lowestoft - not a bad warehosue location to serve E Anglia what's the problem?

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#12 RE: Interview Riddle
13/11/2009 11:25

Terry Cooper to Tony Yeboah (#11)

Wouldn't Norwich be better?

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#13 RE: Interview Riddle
13/11/2009 14:04

Spin Doctor to Terry Cooper (#12)

Norwich is now known as 'Aviva'.

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#14 RE: Interview Riddle
16/11/2009 10:18

Gordon Ramsey to Spin Doctor (#13)

Isn't Delia Smith a director of Aviva City FC?

Geek - you suck bigtime at maths!!

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#15 RE: Interview Riddle
16/11/2009 10:56

The Fox to Gordon Ramsey (#14)

Have you seen that fox who is the manager of Birmingham City FC?

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#16 RE: Interview Riddle
16/11/2009 16:18

Alex McLeish to The Fox (#15)

Me? A fox? Why thank you, you dirty boy!

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#17 RE: Interview Riddle
16/11/2009 17:24

Karrrrrrrrrrren Brady to Alex McLeish (#16)

I darn't work at Bimmingham seedy footy club no more. I is taking a job wiv Alan Shugar for his apprentice show innit.

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