The Diablo cycling club has a good regime for training to do a double century. They are referring to miles, but I think it works if you read it as kilometers. We have 10 weeks. I think the key factor is working up to 150km (with hills) a couple weeks before the event.
I don't expect to be able to do more than 20k on weekdays, with a long ride on saturday and perhaps a long run on Sunday. I think it should be enough.
Sud