Can a king cobra eat other snakes?

If given an opportunity yes. Catching a mamba would be difficult for a King Cobra because mambas are extremely quick, but King cobra venom is extremely potent and in most cases, the king can kill and eat a mamba comfortably. They are too big when compared to a Mamba to defend itself.

considering they are very similar in length, an adult black mamba and an adult king cobra would not view each other as a potential meal. If it was a baby black mamba then the king cobra could eat it, but only if it could catch it without getting bitten itself. catching it would be nearly impossible because black mambas are the fastest venomous land snake in the world, and cobras are clumsy animals while the black mamba is extremely crafty and intelligent. Would be interesting to watch as I don't like snakes.