Present Simple/Continuous, is there a rule in this case?

[bagzi94]

a) When are you working in that factory?
or
b) When do you work in that factory?

The book says a), but I don't understand why.

[bhaisahab]

a) When are you working in that factory?
or
b) When do you work in that factory?

The book says a), but I don't understand why.

Both are correct in the proper context.

[billmcd]

a) When are you working in that factory?
or
b) When do you work in that factory?

The book says a), but I don't understand why.

Well, I hope "the book says" why, because either could be OK depending (as always) on context.

[bagzi94]

Examples?

[bhaisahab]

Could somebody give[/COLOR] examples please?

Bhai.

[bagzi94]

Sorry! If the answer would be:
On Monday.
or
From 7 AM to 3 PM.

What would be appropriate here? Thanks in advance!

[bhaisahab]

Sorry! If the answer would be:
"On Monday."
or
"From 7 AM to 3 PM."

Both would be correct with those examples.