manuscript

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

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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Source: Beat The GMAT — Data Sufficiency | Sun Jun 21, 2009 1:59 am

SanjeevK: Senior | Next Rank: 100 Posts; Posts: 89; Joined: Sat May 30, 2009 2:49 am; Thanked: 9 times

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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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Tue Jun 23, 2009 12:25 pm

thanks.

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