I know that a or an in sentences like the following is your choice--it can be used there or omitted as you prefer.
We need a car or (a) bike to get out of this area. Russian soldiers will be here soon.
I'd like to ask whether the second article a in the following can be omitted.
I wonder which type of vehicle you have - a car or (a) bike
Do you have a car for you to ride or (a) bike for your girlfriend to ride?
Thank you for your help.