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Author Topic: Add Maths June 8, 10 2010  (Read 12558 times)

Offline cooldude

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Re: Add Maths June 8, 10 2010
« Reply #15 on: May 30, 2010, 11:58:23 am »
Quote from: A@di on May 30, 2010, 11:54:41 am
isnt it 28.9 km/h?

what part did i get wrong, cud u post ur working?
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Offline J.Darren

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Re: Add Maths June 8, 10 2010
« Reply #16 on: May 30, 2010, 12:06:35 pm »


Am I correct ???
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Offline Ghost Of Highbury

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Re: Add Maths June 8, 10 2010
« Reply #17 on: May 30, 2010, 12:38:17 pm »
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Offline Ghost Of Highbury

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Re: Add Maths June 8, 10 2010
« Reply #18 on: May 30, 2010, 12:45:59 pm »
Quote from: jellybeans on May 30, 2010, 08:30:19 am
HIIII, lol. could you see what i did .. wrong please? :/

check the above post.

ur answer is correct, whats the matter? ms trouble?
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Offline J.Darren

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Re: Add Maths June 8, 10 2010
« Reply #19 on: May 30, 2010, 01:10:06 pm »
Quote from: A@di on May 30, 2010, 12:45:59 pm
check the above post.

ur answer is correct, whats the matter? ms trouble?
Right that means I have made a mistake somewhere, mind pointing it out for me?  :)
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holtadit

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Re: Add Maths June 8, 10 2010
« Reply #20 on: May 30, 2010, 01:12:35 pm »
What year is this from A@di
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Offline Ghost Of Highbury

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Re: Add Maths June 8, 10 2010
« Reply #21 on: May 30, 2010, 01:21:35 pm »
Quote from: J.Darren on May 30, 2010, 01:10:06 pm
Right that means I have made a mistake somewhere, mind pointing it out for me?  :)

lemme check...from what i saw, ur diagram is incorrect..considering 315 as the bearing the angle b/w the liner and lifeboat path shud be 135 degree which is obtuse, its acute in ur diagram...gotta extend the 90km line till the angle made by the third line is obtuse to the 54 km line
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Offline Ghost Of Highbury

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Re: Add Maths June 8, 10 2010
« Reply #22 on: May 30, 2010, 01:23:37 pm »
and how did u get 45 degree in ur diagram?? it shud be 19.9 , check mine ..
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holtadit

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Re: Add Maths June 8, 10 2010
« Reply #23 on: May 30, 2010, 01:34:41 pm »
My exact answer is  28 13/15  km/h

Is that right ?
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Offline J.Darren

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Re: Add Maths June 8, 10 2010
« Reply #24 on: May 30, 2010, 01:37:56 pm »
Quote from: A@di on May 30, 2010, 01:23:37 pm
and how did u get 45 degree in ur diagram?? it shud be 19.9 , check mine ..
The ship is travelling at a bearing of 090, and it is 90km away from the lifeboat at the time of the call of distress. The liner is also on a bearing of 315 from the ship. When you draw the diagram, you can mark down 45 degrees twice - one is between the 54 km and the 90 km, and one is between the 90km and the normal at that point. I am guessing that you have made an assumption that the ship is at a bearing of 315 from the lifeboat AFTER it has moved 54 km ...
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holtadit

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Re: Add Maths June 8, 10 2010
« Reply #25 on: May 30, 2010, 01:39:09 pm »
Quote from: J.Darren on May 30, 2010, 01:37:56 pm
The ship is travelling at a bearing of 090, and it is 90km away from the lifeboat at the time of the call of distress. The liner is also on a bearing of 315 from the ship. When you draw the diagram, you can mark down 45 degrees twice - one is between the 54 km and the 90 km, and one is between the 90km and the normal at that point. I am guessing that you have made an assumption that the ship is at a bearing of 315 from the lifeboat AFTER it has moved 54 km ...

Darren which year is this from so we can check our answer ?
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Offline J.Darren

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Re: Add Maths June 8, 10 2010
« Reply #26 on: May 30, 2010, 01:41:44 pm »
Quote from: Ari Ben Canaan on May 30, 2010, 01:39:09 pm
Darren which year is this from so we can check our answer ?
Honeslty I have no idea LOL, perhaps you should ask the guy who posted the question :D
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Offline jellybeans

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Re: Add Maths June 8, 10 2010
« Reply #27 on: May 30, 2010, 02:13:00 pm »
Quote from: A@di on May 30, 2010, 12:45:59 pm
check the above post.

ur answer is correct, whats the matter? ms trouble?

:O guess so! thats what it says in the ms
|
v

;)

Quote from: J.Darren on May 30, 2010, 01:41:44 pm
Honeslty I have no idea LOL, perhaps you should ask the guy who posted the question :D

AND I AM NOT A GUY.

... so is the MS right? D:
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Offline theharrovian

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Re: Add Maths June 8, 10 2010
« Reply #28 on: May 30, 2010, 02:16:48 pm »
I reckon J.Darren is correct, the problem is that everybody bar him has misinterpreted the question. The question states that "At 0600 hours the liner, which is 90 km from a lifeboat and on a bearing of 315 from the lifeboat...". All the other answers seem to assume that the liner is on a bearing of 315 from the lifeboat at 0730 hours, and not at 0600 hours.

cooldude, you've just made a computation error - everything is correct up to the bit when you somehow say that A is 133.75 km.
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Offline J.Darren

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Re: Add Maths June 8, 10 2010
« Reply #29 on: May 30, 2010, 02:20:31 pm »
Quote from: jellybeans on May 30, 2010, 02:13:00 pm
:O guess so! thats what it says in the ms
|
v

;)

AND I AM NOT A GUY.

... so is the MS right? D:
I do apologise :-[
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