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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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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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