Translation:They open at 11.
"They open the doors at eleven" is very common in English and means the same as "They open at eleven". It should be accepted. Especially since "ka men" means "open door".
Agreed, but then just report it so duo can add the answer to the list of acceptable responses.
Agree that it is common enough (tho certainly not VERY common) that it should be accepted. Reported - apparently ignored.
Not in UK English it isn't. We never say open the doors when talking about a shop. Open or open for business.
"They open at eleven 'o clock" should be correct. Reported November 4th 2018