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Mathematics, 02.12.2019 22:10 boss713

Working simultaneously at their respective constant rates, machines a and b produce 800 nails in x hours. working alone at its constant rate, machine a produces 800 nails in y hours. in terms of x and y, how many hours does it take machine b, working alone at its constant rate, to produce 800 nails?

(a) x/(x+y)
(b) y/(x+y)
(c) xy/(x+y)
(d) xy/(x-y)
(e) xy/(y-x)

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