Will 360 reach 1.5 mill before ps3 reaches 10 mill in Japan?

[Reasonable]

Probably, 360 is pretty close already. However, PS3 is selling well while 360 sales seem to be declining with little to change them, so you never know. If PS3 can sustain or even grow current sales and 360 remains inert then the PS3 might get there first, but it's pretty unlikely. Better to ask can 360 get to 2M before PS3 gets to 10M I'd say.