Article continues below advertisementIn a clip from Kanye West's forthcoming documentary, In Whose Name?, which will be released on Friday, September 19, the rapper talked with mega-billionaire Elon Musk.While the two controversial figures rested on a bed, Musk asked West about his relationship with his ex-wife, Kim Kardashian. "So are you and Kim off and on or something? Or, I don't know. It's hard to tell," the Tesla CEO said.