Data Sufficiency

Machine X and Y work at their respective constatnt rates. HOW many more hour does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X ,working alone?

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

SOS!

imo E


time taken by X to complete a job = x
time taken by Y to complete a job = y

statement I

I am getting 3x = -y [which cannot be right]
unless I did a mistake somewhere

Statement II is insufficient by itself as it only gives the ratio between x and y

Together
3x = -2x

x's cancel out - just plain wrong

So, E

If answer is E - i'll explain further - else I must've messed up somewhere.

I am getting E)

the OA is E,

but i didn't get why the equations are with negative signs...