Machine $M,$ working alone at its constant rate, produces $x$ widgets every $4$ minutes. Machine $N,$ working

Machine $M,$ working alone at its constant rate, produces $x$ widgets every $4$ minutes. Machine $N,$ working alone at its constant rate, produces $y$ widgets every $5$ minutes. If machines $M$ and $N$ working simultaneously at their respective constant rates for $20$ minutes, does machine $M$ produce more widgets than machine $N$ in that time?

(1) $x > 0.8y$
(2) $y = x + 1$

Answer: A

Source: GMAT Prep

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