Ha it's a trick question.
The correct answer is that you shouldn't really connect two batteries in parallel unless you know a bit more about them.
Why? Well what would limit the current if one battery was was really 11.5V and the other 12.5V.
It wouldn't be wise to connect two NiCad batteries together unless the cells were carefully matched and the charge states were close to identical - even then you might get high currents flowing that could damage one of the batteries.