easy

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mariah: Master | Next Rank: 500 Posts; Posts: 131; Joined: Tue Aug 05, 2008 3:28 pm; Thanked: 2 times

by mariah » Sun Feb 01, 2009 1:37 pm

39. People A and B together can finish 800 products in x hours. If it takes y hours for A alone to finish the 800 products, how many hours will it take for B alone to finish the 800 products?

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Source: Beat The GMAT — Problem Solving | Sun Feb 01, 2009 1:37 pm

piyush_nitt: Master | Next Rank: 500 Posts; Posts: 424; Joined: Sun Dec 07, 2008 5:15 pm; Location: Sydney; Thanked: 12 times

Re: easy

by piyush_nitt » Sun Feb 01, 2009 7:14 pm

mariah wrote:39. People A and B together can finish 800 products in x hours. If it takes y hours for A alone to finish the 800 products, how many hours will it take for B alone to finish the 800 products?

1/y + 1/B = 1/x

1/B = 1/x - 1/y

B = xy/y-x

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