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 Post subject: another tricky question
PostPosted: Fri Sep 09, 2011 4:13 pm 
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Joined: Wed May 25, 2011 10:36 pm
Posts: 35
Hi
Can anyone help with these qeustions:

TV 1 and TV 2 are televisions channels both showing films that start at 8:30 pm.
TV 1 puts on advertisements every 10 minutes after the start of a film.
TV 2 puts on advertisements every 15 minutes after the start of a film.
Q. What is the is earliest time that there will be advertisements on both channels at the same time?
answer 9:00pm
Q. If the shortest film ends after 2 hours, how many times (during the films) will advertisements appear on both channels at the same time?
answer 3


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PostPosted: Fri Sep 09, 2011 4:20 pm 
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Joined: Mon Jun 18, 2007 2:32 pm
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Location: East Kent
I always find a diagram helps !


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PostPosted: Fri Sep 09, 2011 4:27 pm 
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Joined: Thu Feb 24, 2011 12:34 pm
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You need to think of common factors or 10 & 15.
So, they will meet 30mins after the program starts for the first time and in 2hrs period they will cross each other 3 times. 9.00pm, 9.30pm, 10.00pm
I hope I am correct.


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PostPosted: Fri Sep 09, 2011 8:06 pm 
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svg123 wrote:
You need to think of common factors of 10 & 15.


Common multiples, not common factors. The common factor is 5. The common multiples are 30, 60, 90 which are what is wanted here.


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PostPosted: Fri Sep 09, 2011 8:09 pm 
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Location: East Kent
still think a diagram would help...


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PostPosted: Fri Sep 09, 2011 10:56 pm 
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xyzzy wrote:
svg123 wrote:
You need to think of common factors of 10 & 15.


Common multiples, not common factors. The common factor is 5. The common multiples are 30, 60, 90 which are what is wanted here.


Sorry, yes common multiple.


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PostPosted: Fri Sep 09, 2011 10:57 pm 
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How about a diagram?


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PostPosted: Mon Sep 12, 2011 8:28 pm 
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Joined: Tue Jul 21, 2009 9:56 pm
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Well, maybe a number line with times on it? I guess that's a kind of diagram. But having said that it's a pretty easy one to do without writing anything down and in an exam it would be quicker not to.

What was tricky about it? :wink:


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PostPosted: Tue Sep 13, 2011 7:45 pm 
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Joined: Wed May 25, 2011 10:36 pm
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Thanks everyone for helping.


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PostPosted: Wed Sep 14, 2011 12:20 pm 
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Joined: Wed Mar 09, 2011 2:22 pm
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I think this is a silly question as it doesn't allow for the adverts to actually take up any time! Surely if the adverts were on every 10 or 15 minutes, you'd need to allow for 2-3 minutes each advert break (unless it's Sky-then about 6!) which would mess the times up ;)


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