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 Forum Index >  Test Paper Related >  Primary 6 Matters P6 Maths! 2012 SA1 Nanyang P1 Q7 & Q27
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 By: geniuskids (offline)  Saturday, September 21 2013 @ 09:41 AM CDT (Read 1484 times)
geniuskids

Hi there, need to clarify the above questions.

My answer for Q7 is 3 but answer key is 1.

Answer key for Q27 is 3000m

Active Member

Registered: 11/12/11
Posts: 169

 By: echeewh (offline)  Monday, September 23 2013 @ 02:26 AM CDT
echeewh

Hello <geniuskids>

Believe in yourself and learn to instil more confidence in your work . There are instances where <Answerkey> provided can be somewhat incorrect, as what you have encountered in Q7. Your answer of A,B and D looks good.

Following is my worked solution to Q27:

Given time taken by both A and B, time ratio can be expressed and we can apply <Common Distance> method, where speed ratio is reverse / inverse of time ratio.

tA : tB
25 : 20
5 : 4

sA : sB
4 : 5

Given speed difference (B-A) of 30 m/min,
sB - sA = 30
5u - 4u = 30
1u --> 30

sA = 4u --> 4 × 30 = 120

Hence, d(SL) = 120 × 25 = 3000m

========

Trust this helps.

Do let me know again if there's further clarification.

Cheers,
Edward

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Registered: 04/21/11
Posts: 627

 By: geniuskids (offline)  Tuesday, September 24 2013 @ 06:39 AM CDT
geniuskids

Hi Edward!

My heartfelt thanks to you again & again!

Now I understand Q27.

Active Member

Registered: 11/12/11
Posts: 169

 By: geniuskids (offline)  Sunday, January 19 2014 @ 03:25 AM CST
geniuskids

Hi Edward,

Just want to thank you for guiding me thru P6 Maths. I scored A* in it without tuition and now I'm in a top IP school. Many thanks for yr great help.

Active Member

Registered: 11/12/11
Posts: 169

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