I'm working through the penguin book for beginners Russian and thier phrases used to say if something is open is this:

kagda rabotayet musee? When is the museum open?
pachyemoo resteran nye rabotayet? Why is the resteraunt closed?

работать - means to work right? I cant remember but I'm sure I have seen a word for open (otkrit I think off the top of my head) I want a simple phrase to remember, just want to check it is right.

Thanks
Andy