machine rates

[john_haddock]

machine x and y work at their respective rates. how many more hours does it take machine Y to fill a production order of a certain size than it takes machine x working alone?

(1) Machine X and Y fill production order in two thirds the time that machine x working alone does
(2) Machine Y working alone fills the production order of this size in 2x the time that machine X working alone does

[RonPurewal]

this problem is solved here:
post15727.html

this is one of those instances in which a user posted a solution that was so good that we didn't even need to add to it.