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by ketkoag » Sun Jun 21, 2009 1:59 am
working together, michelle and john can type a manuscript in 60 hours. How long does it take martha and jeff, working together, to type the sme manuscript.
1)Michelle types 60 words/minute and john types 40 words/min.
2)Martha types 30 words/minute and jeff types 80words/min.
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by SanjeevK » Sun Jun 21, 2009 2:24 am
IMO [spoiler]C:[/spoiler]
A: Together Michelle and John type 100 words/min. This doesn't provide info about the speed of Martha and Jeff. Hence insufficient
B: Together Martha and jeff type 110 words/min. This doesn't provide any info about the time required by Martha and Jeff to complete the manuscript since we don't know how many words are present in manuscript.

Together A and B provide sufficient information.
From A, the total number if words in manuscript can be calculated :
In 1 min, Michelle and John type 100 words. So in 60 hours, they will type 360000 words
From B we know the combined speed of Martha and Jeff. Hence we can find the total time taken.

Hope this helps
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by ketkoag » Tue Jun 23, 2009 12:25 pm
thanks.
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