Machines X and Y can work at their respective constant rates

Source: e-GMAT

Machines X and Y can work at their respective constant rates to manufacture a certain production unit. If both are working alone, then the time taken by machine Y is what percentage more/less than that of machine X?

1) Machines X and Y, working together, complete a production order of the same size in two-thirds the time that machine Y, working alone, does.
2) Machine Y, working alone, fills a production order of twice the size in 6 hrs.

The OA is A

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