OG 2016 Tracker >>> OG2016 Problem Solving Video Solutions (OG Practice)



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OG2016 PS Practice #101.
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?
`x/(x+y)`
`y/(x+y)`
`xy/(x+y)`
`xy/(x-y)`
`xy/(y-x)`
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