Riddles Random Riddle: Cats And Rats December 16, 2019September 7, 2019 gags If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats? Show answer It will take 3 minutes for 100 cats to kill 100 rats. 1 cat can kill 1 rat in 3 minutes, so 100 cats can kill 100 rats in 3 minutes.