What is the length of the Lightning cable that comes with the iPad Air?

Actually have three questions.

1. What is the length of the Lightning cable that came with my iPad Air? I ask because I might need to purchase a new one.

2. My current Lightning cable, the one that came with my Air, the end of the cable, the rubber is coming off, it's stretched. Would AC+ send me a new one?

3. I have an iPhone 5s also, does the iPhone have it's own unique Lightning cable or can I use my iPad Air Lightning cable to charge my iPhone and vice versa, are the Lightning cables universal with the newer products?

Thanks.