3 cats catch 3 rats in 3 minutes. How long it takes for 3 cats to catch 13 rats?

or:3 cats catch 3 rats in 3 minutes. How long it takes for 3 cats to catch 13 rats?

or:3 cats catch 3 rats in 3 minutes. How long it takes for 3 cats to catch 13 rats?

Tags:rat,