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 Post subject: another tricky questionPosted: Fri Sep 09, 2011 4:13 pm

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?
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?

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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 4:20 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7138
Location: East Kent
I always find a diagram helps !

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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 4:27 pm

Joined: Thu Feb 24, 2011 12:34 pm
Posts: 240
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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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 8:06 pm

Joined: Mon Jul 25, 2011 7:38 am
Posts: 86
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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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 8:09 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7138
Location: East Kent
still think a diagram would help...

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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 10:56 pm

Joined: Thu Feb 24, 2011 12:34 pm
Posts: 240
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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 Post subject: Re: another tricky questionPosted: Fri Sep 09, 2011 10:57 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8598

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 Post subject: Re: another tricky questionPosted: Mon Sep 12, 2011 8:28 pm

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8543
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.

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 Post subject: Re: another tricky questionPosted: Tue Sep 13, 2011 7:45 pm

Joined: Wed May 25, 2011 10:36 pm
Posts: 35
Thanks everyone for helping.

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 Post subject: Re: another tricky questionPosted: Wed Sep 14, 2011 12:20 pm

Joined: Wed Mar 09, 2011 2:22 pm
Posts: 710
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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