What will be rate-limit of two different applications with two valid API keys from same IP?

• Will it be only one of the Key will use? so maximum 10k?
• Will rate-limit be 20k?
• When one key API key reached 10k, the other one will be use automatically? so total 20k?
• Will they have seperate box for 10k limit for each Key?

What will be the effective rate limit of two different applications with two valid API keys from the same IP address?

• Will it be whatever only one of the keys can use? So maximum 10k?
• Will rate-limit be 20k?
• When one key API key reached 10k, the other one will be used automatically? So total 20k?
• Will they have a separate 10k limit for each key?